Equity-Based Compensation (Summary of Compensation Expense Connection with Awards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized under the Prior Plan	$ 192	$ 569	$ 1,059
Expense recognized under the Non-Employee Directors Plan	570	444	420
Total stock compensation expense	12,570	9,189	7,122
Tax benefits recognized related to stock compensation expense	3,136	2,509	2,133
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized under the Plan	5,077	7,988	5,643
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized under the Plan	$ 6,731	$ 188	$ 0