Stock-Based Compensation Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2013	1,819,444	2,466,606
Granted		0
Exercised	(420,642)	(453,745)
Canceled	(117,269)	(72,167)
Expired	(905,500)	(121,250)
Balance at December 31, 2014	376,033	1,819,444
Options vested or expected to vest at December 31, 2015		376,033
Exercisable at December 31, 2015		376,033
Balance Weighted Average Exercise Price	$ 20.28	$ 20.31
Grants in Period, Weighted Average Exercise Price		0.00
Exercised, Weighted Average Exercise Price	17.29	16.36
Canceled, Weighted Average Exercise Price	21.80	22.37
Expired, Weighted Average Exercise Price	22.05	34.18
Balance Weighted Average Exercise Price	$ 18.89	20.28
Options, Vested and Expected to Vest, Weighted Average Exercise Price		18.89
Exercisable, Weighted Average Exercise Price		$ 18.89
Outstanding, Weighted Average Remaining Contractual Term		1 year 10 months 11 days
Vested and Expected to Vest, Weighted Average Remaining Contractual Term	3 years 219 days
Exercisable, Weighted Average Remaining Contractual Term	3 years 219 days
Options, Outstanding, Intrinsic Value		$ 2,101,753
Options Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value		452,128
Exercisable, Intrinsic Value		$ 452,128