Stock-Based Compensation Summary of Stock Option Activity (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 1 month 21 days
Options Exercisable, Weighted Average Remaining Contractual Term	3 years 9 months
Share-based Compensation awards, time-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Beginning Balance (in shares)	2,016,231
Options Outstanding, Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 4.38
Options Exercisable, Beginning Balance (in shares)	1,690,040
Options Exercisable, Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 3.66
Granted (in shares)	0
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Vested (in shares)	23,048
Vested, Weighted Average Exercise Price (in dollars per share)	$ 9.86
Exercised (in shares)	(6,250)
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 7.84
Canceled/forfeited (in shares)	(28,750)
Canceled/forfeited, Weighted Average Exercise Price (in dollars per share)	$ 7.87
Options Outstanding, Ending Balance (in shares)	1,981,231
Options Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 4.32
Options Exercisable, Ending Balance (in shares)	1,706,838
Options Exercisable, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 3.73
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 4 months 24 days
Options Exercisable, Weighted Average Remaining Contractual Term	3 years 9 months 18 days
Share-based Compensation awards, performanced-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Beginning Balance (in shares)	185,000
Options Outstanding, Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 8.00
Options Exercisable, Beginning Balance (in shares)	0
Options Exercisable, Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 0.00
Granted (in shares)	228,981
Granted, Weighted Average Exercise Price (in dollars per share)	$ 8.89
Exercised (in shares)	0
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Canceled/forfeited (in shares)	60,557
Canceled/forfeited, Weighted Average Exercise Price (in dollars per share)	$ 8.67
Options Outstanding, Ending Balance (in shares)	353,424
Options Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 8.46
Options Exercisable, Ending Balance (in shares)	0
Options Exercisable, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 0.00
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	9 years 3 months 18 days
Options Exercisable, Weighted Average Remaining Contractual Term	0 years