Stock Based Compensation - Excess Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 815	$ 2,045	$ 109
Excess tax benefit from stock option exercises	$ 815	$ 2,045	$ 109