Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 27, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Expense	$ 43,777	$ 41,990	$ 87,392	$ 82,621
Senior Notes \| 5.875% Senior Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.875%		5.875%		5.875%
Designated as Hedging Instrument \| Interest Rate Swap \| Other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cash Flow Hedge Liability	$ 11,000		$ 11,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Rate Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Notional Amount						$ 500,000
Gain (Loss) on Cash Flow Hedge, Net, Pretax	$ 300	$ (400)	1,000	$ (1,000)
Expected reclassification of AOCI into Interest Expense			$ 2,000