Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Schedule of Gain (Loss) Recorded in OCI Related to Derivative Instruments) (Details)

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Derivative Financial Instruments (Schedule of Gain (Loss) Recorded in OCI Related to Derivative Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Reclassification of derivative loss to interest expense     $ 3,126
Net changes in cash flow hedges, Income tax effect $ (856) $ (47) (649)
Net changes in cash flow hedges, net of tax [1] 5,990 338 4,542
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Effective portion of change in fair market value of derivatives $ 6,846 $ 385 $ 2,065
[1] During the years ended December 31, 2016 or 2015, we did not reclassify any amounts from AOCI to our Consolidated Income Statements. During the year ended December 31, 2014, we reclassified $3.1 million from AOCI to interest expense in our Consolidated Income Statement.