Income Taxes - Changes in Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 105	$ 105	$ 861
Balance as of January 1	105	861	1,465
Increases (decreases) in unrecognized tax benefits:
Due to tax positions taken in prior years	0	0	91
Due to tax positions taken during the current year	60	45	60
Due to settlement with tax authorities	0	(757)	0
Due to expiration of statute	(60)	(44)	(755)
Balance as of December 31	$ 105	$ 105	$ 861