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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Debt - Schedule of Long-Term Debt (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Apr. 28, 2016	Mar. 31, 2012
Debt Instrument [Line Items]
Debt, carrying amount	$ 975,000,000	$ 1,028,375,000
Less: Current maturities of long-term debt	0	(3,375,000)
Less: Deferred financing costs	(2,433,000)	(2,996,000)
Long-term debt, net of deferred financing costs	972,567,000	1,022,004,000
Term Credit Agreement due 2024 at a variable interest rate of 4.0% at December 31, 2018
Debt Instrument [Line Items]
Debt, carrying amount	$ 350,000,000	350,000,000
Variable interest rate	4.00%
Senior Notes due 2022 at a fixed interest rate of 3.75%
Debt Instrument [Line Items]
Debt, carrying amount	$ 325,000,000	325,000,000
Fixed interest rate	3.75%			3.75%
Incremental Term Loan Agreement due 2026 at a variable interest rate of 4.2% at December 31, 2018
Debt Instrument [Line Items]
Debt, carrying amount	$ 300,000,000	300,000,000	$ 300,000,000
Variable interest rate	4.20%
Revolving Credit Facility due 2020 at a variable interest rate of 2.8% at December 31, 2017
Debt Instrument [Line Items]
Debt, carrying amount	$ 0	$ 50,000,000
Variable interest rate		2.80%
New Zealand subsidiary noncontrolling interest shareholder loan at 0% interest rate
Debt Instrument [Line Items]
Debt, carrying amount	$ 0	$ 3,375,000
Fixed interest rate	0.00%