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Debt (Schedule Of The Components Of Long-Term Debt) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total face value of long-term debt	$ 854,886,000	$ 851,575,000
Unamortized debt issuance costs	(17,023,000)	(16,256,000)
Less: current portion of long-term debt	(69,752,000)	(67,923,000)
Total long-term debt	768,111,000	767,396,000
Term Loan [Member] | $500.0 Million Term Loan [Member] | Corporate [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	496,250,000	498,750,000
Debt instrument, face amount	500,000,000	500,000,000
Convertible Notes [Member] | $120.0 Million Convertible Notes [Member] | Corporate [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	62,953,000	61,442,000
Debt instrument, face amount	120,000,000	120,000,000
Convertible Notes [Member] | $170.0 Million Convertible Notes [Member] | Corporate [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	139,654,000	136,739,000
Debt instrument, face amount	170,000,000	170,000,000
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	27,129,000	27,744,000
Partnership [Member] | Revolving Credit Facility [Member] | $235.0 Million Revoling Credit Facility [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	128,900,000	126,900,000
Line of credit, maximum borrowing capacity	$ 235,000,000	$ 235,000,000

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 55
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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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