Common Stock and Stock Compensation - Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Stock Options, Outstanding [Roll Forward]
Outstanding as of December 31, 2011 (shares)	411,726
Granted (shares)	5,989
Exercised (shares)	(27,782)
Canceled (shares)	(181,071)
Outstanding as of December 31, 2012 (shares)	208,862
Vested or expected to vest at December 31, 2012 (shares)	202,526
Exercisable at December 31, 2012 (shares)	166,155
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding as of December 31, 2011, Weighted Average Exercise Price (dollars per share)	$ 20.47
Granted, Weighted Average Exercise Price (dollars per share)	$ 18.07
Exercised, Weighted Average Exercise Price (dollars per share)	$ 12.77
Canceled, Weighted Average Exercise Price (dollars per share)	$ 21.25
Outstanding as of December 31, 2012, Weighted Average Exercise Price (dollars per share)	$ 20.75
Vested and expected to vest at December 31, 2012, Weighted Average Exercise Price (dollars per share)	$ 20.69
Exercisable at December 31, 2012, Weighted Average Exercise Price (dollars per share)	$ 20.77
Stock Options, Additional Disclosures [Abstract]
Outstanding as of December 31, 2012, Weighted-Average Remaining Contractual Term (in years)	7 years 2 months 12 days
Vested and expected to vest at December 31, 2012, Weighted-Average Remaining Contractual Term (in years)	7 years 1 month 6 days
Exercisable at December 31, 2012, Weighted-Average Remaining Contractual Term (in years)	6 years 3 months 18 days
Outstanding as of December 31, 2012, Aggregate Intrinsic Value	$ 252
Vested and expected to vest at December 31, 2012, Aggregate Intrinsic Value	250
Exercisable at December 31, 2012, Aggregate Intrinsic Value	$ 216