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Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in the balances of each component of AOCI      
Balance at the beginning of the period $ 594,595 $ 714,615 $ 738,932
Other comprehensive income (loss), net of tax 35 429 (121)
Balance at the end of the period 840,713 594,595 714,615
Accumulated Other Comprehensive Income      
Changes in the balances of each component of AOCI      
Balance at the beginning of the period 1,777 1,348 1,469
Other comprehensive income (loss) before reclassifications 35 (25)  
Amounts reclassified from AOCI   454  
Other comprehensive income (loss), net of tax   429 (121)
Balance at the end of the period 1,812 1,777 1,348
Foreign Currency Translation      
Changes in the balances of each component of AOCI      
Balance at the beginning of the period 1,797 2,246 2,333
Other comprehensive income (loss) before reclassifications 42 (19)  
Amounts reclassified from AOCI   (430)  
Other comprehensive income (loss), net of tax   (449) (87)
Balance at the end of the period 1,839 1,797 2,246
Foreign Currency Translation | ALD | Other net      
Changes in the balances of each component of AOCI      
Amounts reclassified from AOCI 400    
Foreign Currency Translation | ALD | Accumulated Other Comprehensive Income      
Changes in the balances of each component of AOCI      
Amounts reclassified from AOCI (400)    
Minimum Pension Liability      
Changes in the balances of each component of AOCI      
Balance at the beginning of the period   (866) (881)
Amounts reclassified from AOCI   866  
Other comprehensive income (loss), net of tax   866 15
Balance at the end of the period     (866)
Minimum Pension Liability | Other net      
Changes in the balances of each component of AOCI      
Amounts reclassified from AOCI 900    
Tax benefit related to amounts reclassified from AOCI 400    
Minimum Pension Liability | Accumulated Other Comprehensive Income      
Changes in the balances of each component of AOCI      
Amounts reclassified from AOCI (900)    
Tax benefit related to amounts reclassified from AOCI (400)    
Unrealized Gains (Losses) on Available for Sale Securities      
Changes in the balances of each component of AOCI      
Balance at the beginning of the period (20) (32) 17
Other comprehensive income (loss) before reclassifications (7) (6)  
Amounts reclassified from AOCI   18  
Other comprehensive income (loss), net of tax   12 (49)
Balance at the end of the period $ (27) $ (20) $ (32)