Income Taxes (Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Federal:
Current									$ 71,683	$ 78,315	$ 151,984
Deferred									6,941	(19,754)	16,136
U.S. Federal: Total									78,624	58,561	168,120
U.S. State and Local:
Current									7,186	5,359	(2,604)
Deferred									(9,307)	(8,026)	(26,273)
U.S. State and Local: Total									(2,121)	(2,667)	(28,877)
International:
Current									32,492	28,063	57,906
Deferred									3,820	(5,990)	(82,862)
International: Total									36,312	22,073	(24,956)
Total current									111,361	111,737	207,286
Total deferred									1,454	(33,770)	(92,999)
Total provision for income taxes	$ 33,134	$ 25,310	$ 46,335	$ 8,036	$ 25,922	$ 10,032	$ 24,218	$ 17,795	$ 112,815	$ 77,967	$ 114,287
Effective tax rate									26.20%	20.30%	22.30%