Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Details)

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Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Stockholders' equity, beginning balance $ 296,121,000  
Current period other comprehensive income (loss), net of tax (300,000) $ 846,000
Stockholders' equity, ending balance 266,975,000  
Reclassification out of accumulated other comprehensive loss 0  
Foreign Currency Items    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Stockholders' equity, beginning balance (3,512,000)  
Current period other comprehensive income (loss), net of tax (300,000)  
Stockholders' equity, ending balance $ (3,812,000)