Stock-based Compensation and Benefits (Summarizes Information about Outstanding Stock Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number	2,185,922	2,596,251	3,597,111
Options Outstanding, Weighted Average Remaining Contractual Life in years	4 years 10 months 6 days	4 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 19.81	$ 19.84	$ 19.90
Options Vested, Number	313,403
Options Vested, Weighted Average Exercise Price	$ 19.34
18.09 - 18.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	18.00
Options Outstanding, High Range of Exercise Price	$ 18.99
Options Outstanding, Number	162,815
Options Outstanding, Weighted Average Remaining Contractual Life in years	6 years 8 months 19 days
Options Outstanding, Weighted Average Exercise Price	$ 18.51
Options Vested, Number	91,978
Options Vested, Weighted Average Exercise Price	$ 18.57
19.00 - 19.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	19.00
Options Outstanding, High Range of Exercise Price	$ 19.99
Options Outstanding, Number	279,718
Options Outstanding, Weighted Average Remaining Contractual Life in years	8 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 19.38
Options Vested, Number	40,515
Options Vested, Weighted Average Exercise Price	$ 19.17
20.00 and above
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	$ 20.00
Options Outstanding, Number	1,743,389
Options Outstanding, Weighted Average Remaining Contractual Life in years	3 years 3 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 20.02
Options Vested, Number	1,719,365
Options Vested, Weighted Average Exercise Price	$ 20.00