Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign currency translation adjustment	$ 26	$ 233	$ (84)	$ 445
Reclassification of net gains on derivative instruments	(2,448)	(901)	(2,324)	(1,187)
Other comprehensive loss	(2,422)	(668)	(2,408)	(742)
Other Comprehensive Income (Loss), Tax [Abstract]
Foreign currency translation adjustment	0	0	0	0
Reclassification of net gains on derivative instruments	942	346	892	452
Other comprehensive loss	942	346	892	452
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	26	233	(84)	445
Reclassification of net gains on derivative instruments	(1,506)	(555)	(1,432)	(735)
Other comprehensive loss	$ (1,480)	$ (322)	$ (1,516)	$ (290)