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Stockholders' Equity - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains on investments $ 58 $ 56
Tax effect (2,741) 3,452
Income (loss) from continuing operations 7,329 (6,959)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains on Investments    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains on investments (25) (20)
Tax effect 9 8
Income (loss) from continuing operations (16) (12)
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Net Actuarial Loss and Prior Service Credit, Net    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Recognized net actuarial (gain) loss [1] 179 255
Amortization of prior service credit [1] (126) (137)
Tax effect (20) (45)
Income (loss) from continuing operations $ 33 $ 73
[1] Amount included in pension expense. Refer to Note 16 – Pension and Postretirement Benefits.