Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 112,403	$ 17,152	$ 226,126
Other comprehensive income (loss):
Foreign currency translation adjustments	1,772	1,357	24
Change in unrealized gains (losses) on available-for-sale securities, net of tax of $(697), $538, and $(43), respectively	(1,116)	856	(68)
Total other comprehensive income (loss)	656	2,213	(44)
Comprehensive income	$ 113,059	$ 19,365	$ 226,082