Equity-Based Compensation (PSUs Eligible for Conversion to Cash) (Details) - Performance Shares - USD ($) $ 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 [Line Items]
Equity Based Compensation Percent Of Targeted Performance Stock Units Earned	200.00%	200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	256,000	438,000
Percentage earned on target shares				50.00%
Units earned based on target units				237,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Units Earned and Convertible to Cash	128,000	219,000	231,000	114,000
Aggregate fair value of vested share-based payment award	$ 3,100	$ 4,039	$ 4,233