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Derivative Instruments (Effect of Derivatives on Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Interest expense, net $ 9,356 $ 7,348 $ 15,016 $ 12,318
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized gain (loss) on interest rate contracts [1] (50) 123 (86) 290
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income, net of tax 1,056 (226) 64 (228)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Loss reclassified from accumulated other comprehensive income [1] $ (193) (41) $ (195) (91)
Derivatives not designated as Hedging Instrument [Member] | Lumber Price Contracts [Member] | Gain on Lumber Hedge [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized gain on lumber price swap   $ 3,265   $ 3,265
[1] Realized gain (loss) on hedging instruments consist of net cash settlements and interest accruals on interest rate swaps during the periods. Net cash settlements are included in the supplemental cash flow information within interest, net of amounts capitalized in the Condensed Consolidated Statements of Cash Flows