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Employee Benefit Plans, Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]            
Unamortized net actuarial gain (loss) $ (192) $ 289 $ (192)      
Deferred tax (expense) benefit at 35% 67 (101) 67      
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ (125) $ 188 $ (125) $ (125) $ 188 $ 188
Deferred Tax Benefit, Percentage 35.00% 35.00% 35.00%