Equity-Based Compensation Plans Employee Plans Equity Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	$ 8,630	$ 8,184	$ 6,876
Related tax benefit	3,193	2,955	2,049
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	2,116	1,966	1,801
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	4,408	4,964	5,075
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	$ 2,106	$ 1,254	$ 0