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Network
941901 - Disclosure - Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details)
(http://bench.com/role/AccumulatedOtherComprehensiveLossScheduleOfAccumulatedOtherComprehensiveLossByComponentDetails)
TableAccumulated Other Comprehensive Income Loss [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000863436 (http://www.sec.gov/CIK)
Accumulated other comprehensive income loss [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Statement, Equity Components [Axis]Statement, Equity Components [Axis]Statement, Equity Components [Axis]
Foreign currency translaction adjustments [Member]Derivative instruments, net of tax [Member]Unrealized loss on investments, net of tax [Member]Other [Member]Equity Component [Domain]Foreign currency translaction adjustments [Member]Derivative instruments, net of tax [Member]Unrealized loss on investments, net of tax [Member]Other [Member]Equity Component [Domain]Foreign currency translaction adjustments [Member]Derivative instruments, net of tax [Member]Unrealized loss on investments, net of tax [Member]Other [Member]Equity Component [Domain]
Accumulated other comprehensive loss, net of tax, beginning balance
(13,079,000) 
0  
(95,000) 
158,000  
(13,016,000) 
(9,688,000) 
0  
(64,000) 
277,000  
(9,475,000) 
(8,090,000) 
0  
(1,433,000) 
429,000  
(9,094,000) 
Other comprehensive gain (loss) before reclassifications
(1,465,000) 
286,000  
21,000  
(1,000) 
(1,159,000) 
(3,391,000) 
0  
(31,000) 
(106,000) 
(3,528,000) 
(4,528,000) 
0  
1,369,000  
(122,000) 
(3,281,000) 
Amounts reclassified from accumulated other comprehensive loss
0  
0  
0  
(1,000) 
(1,000) 
0  
0  
0  
(13,000) 
(13,000) 
2,930,000  
0  
0  
(30,000) 
2,900,000  
Other comprehensive loss
(1,465,000) 
 
286,000  
 
21,000  
 
(2,000) 
 
(1,160,000) 
 
(3,391,000) 
 
0  
 
(31,000) 
 
(119,000) 
 
(3,541,000) 
 
(1,598,000) 
 
0  
 
1,369,000  
 
(152,000) 
 
(381,000) 
 
Accumulated other comprehensive loss, net of tax, ending balance
(14,544,000) 
 
286,000  
 
(74,000) 
 
156,000  
 
(14,176,000) 
 
(13,079,000) 
 
0  
 
(95,000) 
 
158,000  
 
(13,016,000) 
 
(9,688,000) 
 
0  
 
(64,000) 
 
277,000  
 
(9,475,000)