Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 64,461	$ 92,006	$ 124,149	$ 160,273
Other comprehensive income (loss):
Change in foreign currency translation adjustment	3,985	(11,802)	(2,829)	(9,850)
Available for sale securities:
Change in net unrealized gains	(2,715)	1,023	(3,093)	2,457
Less: reclassification adjustment for net losses (gains) included in net income	54	(3,055)	(31)	(2,862)
Net change (net of tax effect)	(2,661)	(2,032)	(3,124)	(405)
Loss on pension liability	0	0	(334)	0
Cash flow hedges:
Change in unrealized gains	(1,846)	(4,378)	(5,295)	(2,344)
Less: reclassification adjustment for net losses included in net income	1,788	779	2,312	2,306
Net change (net of tax effect)	(58)	(3,599)	(2,983)	(38)
Other comprehensive income (loss)	1,266	(17,433)	(9,270)	(10,293)
Comprehensive income	$ 65,727	$ 74,573	$ 114,879	$ 149,980