Debt Obligations (Schedule of Long Term Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Nov. 09, 2018
Debt Instrument [Line Items]
Total long term obligations	$ 1,479,077	$ 1,484,384
Unsecured Debt	493,376	0
Convertible Debt	222,391	213,461
Other Long-term Debt	11,141	11,746
Less: current portion	(13,746)	(14,707)
Total long term obligations, net	$ 1,465,331	1,469,677
Senior Notes 2nd Term Loan [Member]
Debt Instrument [Line Items]
Total long term obligations			$ 675,000
Unsubordinated term loan and Revolving credit facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral, Coverage Percentage	115.00%
Unsubordinated term loan [Member]
Debt Instrument [Line Items]
Total long term obligations	$ 612,169	626,277
Revolving credit facility [Member]
Debt Instrument [Line Items]
Total long term obligations	140,000	$ 632,900
Line of Credit Facility, Maximum Borrowing Capacity	250,000
line of credit, increase in maximum borrowing capacity	$ 600,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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