Stock-Based Compensation Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Cash received from option exercises	$ 1,857	$ 332	$ 4,279
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning of period	2,395,107	2,695,276	2,659,884
Options granted	0	31,500	462,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.00	$ 16.71	$ 22.99
Options exercised	(109,045)	(21,730)	(274,551)
Options exercised, weighted average exercise price (in dollars per share)	$ 16.65	$ 15.29	$ 15.46
Options forfeited and expired	(46,620)	(309,939)	(152,307)
Options, forfeited and expired, weighted average exercise price (in dollars per share)	$ 24.51	$ 23.63	$ 26.23
Options outstanding, end of period	2,239,442	2,395,107	2,695,276
Options outstanding, weighted average exercise price	$ 24.48	$ 24.13	$ 24.09	$ 23.51
Options outstanding, weighted average remaining contractual term	5 years 29 days
Options outstanding, intrinsic value	$ 5,327
Options exercisable	1,585,813
Options exercisable, weighted average exercise price (in dollars per share)	$ 24.20
Options exercisable, weighted average remaining contractual term (in years)	4 years 11 months 12 days
Options exercisable, intrinsic value	$ 4,096
Options, vested and expected to vest, net of anticipated forfeitures	2,174,579
Options, vested and expected to vest, net of anticipated forfeitures, weighted average exercise price (in dollars per share)	$ 24.43
Options, vested and expected to vest, net of anticipated forfeitures, weighted average remaining contractual term (in years)	5 years 29 days
Options, vested and expected to vest, net of anticipated forfeitures, aggregate intrinsic value	$ 5,237
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 700	$ 100	$ 1,800