Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details)

v3.8.0.1
Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Apr. 24, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 20, 2012
Derivative [Line Items]                
Derivative, notional amount $ 250,000   $ 250,000     $ 187,500    
Derivative, fixed interest rate 2.3525%   2.3525%   1.05%     0.8525%
Change in fair value of derivative instrument, net of tax $ 13 $ 857 $ (47) $ (630)        
Interest Rate Derivative Assets, at Fair Value $ 3,481   3,481       $ 3,577  
Interest Rate Derivative Liabilities, at Fair Value   $ 1,160   $ 1,160        
Estimated unrealized income to be realized in the next twelve months     $ 1,000