Other Asset Impairments Other Asset Impairments (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Asset Impairment Charges [Abstract]
Impairment charges and other	$ (600)	$ 1,300	$ 9,800		$ 10,480	$ 3,687	$ 3,342
Texas Sales and Use Tax Assessment Settlement Amount	$ 200				200
Proceeds from sale of aircraft					$ 12,159	$ 0	$ 0
Cost Method Investments								$ 2,800
TRE Impairment				$ 2,700