Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 23,043	$ 19,036	$ 45,394	$ 37,372
Other comprehensive income (loss):
Foreign currency translation adjustments	(2,122)	1,366	(465)	(4,034)
Total other comprehensive income (loss)	(2,122)	1,366	(465)	(4,034)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	20,921	20,402	44,929	33,338
Net Income (Loss) Attributable to Noncontrolling Interest	51	0	243	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 20,870	$ 20,402	$ 44,686	$ 33,338