Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 9,321	$ 6,965	$ 7,102
Tax positions taken during prior periods	9,944	0	0
Tax positions taken during the current period	3,350	0	215
Acquisition	556	2,528	0
Settlements	(15,144)	(172)	(175)
Lapse of the applicable statute of limitations	0	0	(177)
Balance at December 31	8,027	9,321	6,965
Interest and penalties	9,614	0	(32)
The liability for unrecognized tax benefits included accrued interest	$ 1,031	$ 0	$ 0