Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Fair Value Of Assets And Liabilities) (Details)

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Fair Value Measurements (Fair Value Of Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Term Loan [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, carrying value $ 493,750 $ 500,000 $ 500,000
Term loan, fair value 493,750 500,000 500,000
Term Loan [Member] | Level 1 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, fair value 0 0 0
Term Loan [Member] | Level 2 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, fair value 493,750 500,000 500,000
Term Loan [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, fair value 0 0 0
Revolving Credit Facility [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, carrying value 130,000 140,000 175,000
Term loan, fair value 130,000 140,000 175,000
Revolving Credit Facility [Member] | Level 1 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, fair value 0 0 0
Revolving Credit Facility [Member] | Level 2 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, fair value 130,000 140,000 175,000
Revolving Credit Facility [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Term loan, fair value $ 0 $ 0 $ 0