Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income(Loss)) (Details)

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Shareholders' Equity Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income(Loss)) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Other comprehensive loss before reclassifications $ (718) $ (1,579)    
Amounts reclassified from accumulated other comprehensive income to interest expense in the consolidated statements of operations 622 567    
Income tax benefit 49 382    
Other comprehensive loss, net of tax (47) (630)    
Accumulated other comprehensive income (loss) $ 2,173 $ (725) $ 2,220 $ (95)