Income Taxes - Unrecognized Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Gross unrecognized tax benefits at beginning of year	$ 16,386	$ 21,240	$ 20,010
Increases in tax positions for prior years	2,692	623	1,500
Decreases in tax positions for prior years	0	(1,287)	(270)
Decreases from lapse in statute of limitations	(2,670)	(4,190)	0
Settlements	(1,584)	0	0
Gross unrecognized tax benefits at end of year	$ 14,824	$ 16,386	$ 21,240