For The Years Ended December 31, | |||||||||||
2013 | 2012 | 2011 | |||||||||
Gas drilling obligations | $ | 109,609 | $ | 110,975 | $ | 108,167 | |||||
Firm transportation expense | 126,766 | 78,475 | 59,606 | ||||||||
Major equipment purchases | 12,668 | 101,367 | 34,219 | ||||||||
Other | — | 492 | 891 | ||||||||
Total costs related to purchase obligations | $ | 249,043 | $ | 291,309 | $ | 202,883 | |||||