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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Net effect on other comprehensive income (loss) $ (413) $ 0 $ (577) $ 0
Cash Flow Hedging [Member] | Other Comprehensive Income (Loss) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized on derivative, net of tax of $(264) and $(369) (effective portion) (490) 0 (654) 0
Interest Expense [Member] | Fair Value Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized gain on interest rate contracts [1] 214 409 456 788
Interest Expense [Member] | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) reclassified into income (effective portion) $ (77) $ 0 $ (77) $ 0
[1] Realized gain on hedging instruments consists of net cash settlements and interest accruals on the fair value 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