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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Average fixed interest rate related to the group of interest rate derivatives.

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Average variable interest rate related to the group of interest rate derivatives.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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The loss recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Interest Rate Swaps (Details) - USD ($) $ in Thousands	12 Months Ended
Interest Rate Swaps (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 20, 2018	Apr. 05, 2017
Derivative [Line Items]
Increase in fair value of interest rate swaps	$ 895	$ 1,449
Term Loan
Derivative [Line Items]
Outstanding debt	700,000
Interest Rate Swap
Derivative [Line Items]
Derivative instruments, notional amount				$ 400,000	$ 400,000
Ineffectiveness recognized	0	0	$ 0
Interest Rate Swap \| Term Loan
Derivative [Line Items]
Derivative instruments, notional amount	200,000
Outstanding debt	$ 200,000			400,000
Interest Rate Swap \| Term Loan Maturing April 27, 2022
Derivative [Line Items]
Derivative instruments, notional amount				200,000	200,000
Weighted average effective fixed interest rate	3.90%
Interest Rate Swap \| Term Loan Maturing December 17,2021
Derivative [Line Items]
Derivative instruments, notional amount				$ 200,000	$ 200,000
Weighted average effective fixed interest rate					3.30%
Average variable interest rate	1.30%
Interest Rate Swap \| Term Loan Maturing December 17 2023
Derivative [Line Items]
Derivative instruments, notional amount	$ 100,000
Interest Rate Swap \| Term Loan Maturing April 27 2024
Derivative [Line Items]
Derivative instruments, notional amount	100,000
Cash flow hedging \| Interest Rate Swap
Derivative [Line Items]
Derivative instruments, notional amount	1,000,000	400,000
Derivative Asset, fair Value	5,300
Derivative Liability, fair Value	3,000
Fair value	$ 2,343	$ 1,449