Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Apr. 28, 2016	Mar. 31, 2012	Nov. 30, 2011
Debt Instrument [Line Items]
Debt, carrying amount	$ 1,028,375	$ 1,065,472
Less: Current maturities of long-term debt	(3,375)	(31,676)
Less: Deferred financing costs	(2,996)	(3,591)
Long-term debt, net of deferred financing costs	1,022,004	1,030,205
Term Credit Agreement due 2024 at a variable interest rate of 3.0% at December 31, 2017
Debt Instrument [Line Items]
Debt, carrying amount	$ 350,000	350,000
Variable interest rate	3.00%
Senior Notes due 2022 at a fixed interest rate of 3.75%
Debt Instrument [Line Items]
Debt, carrying amount	$ 325,000	325,000
Fixed interest rate	3.75%			3.75%
Incremental Term Loan Agreement due 2026 at a variable interest rate of 3.3% at December 31, 2017
Debt Instrument [Line Items]
Debt, carrying amount	$ 300,000	300,000	$ 300,000
Variable interest rate	3.30%
Mortgage notes due 2017 at fixed interest rates of 4.35%
Debt Instrument [Line Items]
Debt, carrying amount	$ 0	31,676
Fixed interest rate	4.35%				4.35%
Revolving Credit Facility due 2020 at a variable interest rate of 2.8% at December 31, 2017
Debt Instrument [Line Items]
Debt, carrying amount	$ 50,000	25,000
Variable interest rate	2.80%
Solid waste bonds repaid in 2017 at a variable interest rate of 2.0% at December 31, 2016
Debt Instrument [Line Items]
Debt, carrying amount	$ 0	$ 15,000
Variable interest rate		2.00%
New Zealand JV noncontrolling interest shareholder loan at 0% interest rate
Debt Instrument [Line Items]
Debt, carrying amount	$ 3,375	$ 18,796
Fixed interest rate	0.00%