Debt (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt
Amortization of deferred financing costs	$ 1,116	$ 880	$ 3,018	$ 2,688
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(457)	0	(402)	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments			402	0
Total Interest Expense	23,333	24,629	68,632	78,772
Senior Notes [Member]
Debt
Interest expense	5,954	5,954	17,842	22,485
Secured Debt [Member]
Debt
Interest expense	5,001	6,753	15,575	20,171
Revolver and Term Loans
Debt
Interest expense	$ 10,805	$ 11,042	$ 31,795	$ 33,428