Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Interest Rate Swap
Derivatives:
Asset for Swaps		$ 600
Recurring
Financial Assets:
Cash and cash equivalents	$ 137,286	105,185
Restricted cash	9,862	10,517
Other investments	2,513	1,898
Total	149,661	117,600
Financial Liabilities:
Contingent consideration	1,900	4,509
Total debt	1,590,050	1,690,731
Total	1,591,950	1,695,240
Recurring | Interest Rate Swap
Derivatives:
Asset for Swaps		572
Derivative Liability	98,259	47,691
Recurring | Level 1
Financial Assets:
Cash and cash equivalents	137,286	105,185
Restricted cash	8,184	9,791
Other investments	0	0
Total	145,470	114,976
Financial Liabilities:
Contingent consideration	0	0
Total debt	0	0
Total	0	0
Recurring | Level 1 | Interest Rate Swap
Derivatives:
Asset for Swaps		0
Derivative Liability	0	0
Recurring | Level 2
Financial Assets:
Cash and cash equivalents	0	0
Restricted cash	1,678	726
Other investments	2,513	1,898
Total	4,191	2,624
Financial Liabilities:
Contingent consideration	0	0
Total debt	1,590,050	1,690,731
Total	1,590,050	1,690,731
Recurring | Level 2 | Interest Rate Swap
Derivatives:
Asset for Swaps		572
Derivative Liability	98,259	47,691
Recurring | Level 3
Financial Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Other investments	0	0
Total	0	0
Financial Liabilities:
Contingent consideration	1,900	4,509
Total debt	0	0
Total	1,900	4,509
Recurring | Level 3 | Interest Rate Swap
Derivatives:
Asset for Swaps		0
Derivative Liability	$ 0	$ 0