Goodwill and Intangible Assets Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill Beginning	$ 398,941	$ 288,770
Foreign currency translation adjustments and other	(344)	408
Goodwill acquired during the year	308	109,763
Goodwill Ending	398,905	398,941	288,770
Amortization expense	$ 19,230	$ 14,792	$ 13,376