Income Taxes - Provisions for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Domestic	$ 4,039	$ 13,169	$ 18,982
Foreign	108,212	81,556	54,525
Total current	112,251	94,725	73,507
Deferred:
Domestic	26,170	12,144	20,529
Foreign	(5,516)	(4,642)	10,655
Total deferred	20,654	7,502	31,184
Total provision for income taxes	132,905	102,227	104,691
Cash taxes paid	$ 92,422	$ 72,825	$ 121,440