Share-Based Compensation Plans (Options) (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015
Number of Shares
Options outstanding, beginning balance	1,826,000
Options granted	0	290,737
Options exercised	(321,000)
Options canceled	(1,000)
Options outstanding, ending balance	1,504,000
Options vested and expected to vest	1,503,000
Options exercisable	1,437,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding, beginning balance	$ 21.22		$ 21.33
Options granted	0.00
Options exercised	21.83
Options canceled	30.52
Options outstanding, ending balance	21.22		$ 21.33
Options vested and expected to vest	21.22
Options exercisable	$ 20.73
Intrinsic Value [Abstract]
Options outstanding, Aggregate Intrinsic Value	$ 23,481
Options vested and expected to vest, Aggregate Intrinsic Value	23,478
Options exercisable, Aggregate Intrinsic Value	$ 23,148
Weighted Average Remaining Contractual Term [Abstract]
Options outstanding, Weighted Average Remaining Contractual Term	4 years 6 months 24 days
Options vested and expected to vest, Weighted Average Remaining Contractual Term	4 years 6 months 24 days
Options exercisable, Weighted Average Remaining Contractual Term	4 years 5 months 10 days