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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