CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 12,818	$ 3,369	$ 48,637	$ 58,681
Other comprehensive income (loss):
Change in fair value of derivative instruments	187	0	2,043	0
Foreign currency translation adjustments	2,693	4,514	(4,285)	4,687
Comprehensive income	$ 15,698	$ 7,883	$ 46,395	$ 63,368