CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 55,312	$ 41,660
Other comprehensive income (loss):
Foreign currency translation adjustments	173	(8,132)
Comprehensive income	$ 55,485	$ 33,528