Goodwill and Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Finite-lived Intangible Assets, Gross [Roll Forward]
Intangible assets, January 1	$ 7,602	$ 6,900
Additions	0	0
Total intangible assets, end of period	7,602	6,900
Accumulated Amortization [Roll Forward]
Accumulated amortization	(6,975)	(6,900)
Current year amortization	(241)
Total accumulated amortization	(7,216)	(6,900)
Net intangible assets, end of period	$ 386	$ 0