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Long-Term Debt, Debt Facilities (Details)
$ in Thousands, ¥ in Billions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2016
JPY (¥)
Jun. 16, 2016
USD ($)
Oct. 09, 2014
USD ($)
Oct. 09, 2014
JPY (¥)
Long-term Debt [Abstract]                
Balance [1] $ 401,768              
Current portion of long-term debt 77,840 $ 82,727            
Unamortized debt discount 9,100              
Unamortized debt issuance costs 4,000              
Unamortized debt discount and debt issuance costs 13,100              
Interest expense 22,200 15,600 $ 7,900          
Credit Agreement [Member]                
Long-term Debt [Abstract]                
Unamortized debt discount and debt issuance costs 2,000              
Term Loan Facility [Member]                
Long-term Debt [Abstract]                
Original principal amount 127,500           $ 127,500  
Balance $ 94,800 [2],[3] 108,400            
Interest rate Variable 30 day: 4.319%              
Interest rate 4.319%     4.319%        
Term of variable rate 30 days              
Repayment terms One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.              
Percentage of principal payable in installments 50.00%              
Frequency of payment Quarterly              
Term of loan 5 years              
Current portion of long-term debt $ 16,700              
Japanese Yen Term Loan Facility [Member]                
Long-term Debt [Abstract]                
Original principal amount | ¥       ¥ 6.6       ¥ 6.6
Balance $ 43,500 [2],[3] 47,900   ¥ 4.9 [2],[3] ¥ 5.6      
Interest rate Variable 30 day: 2.75%              
Interest rate 2.75%     2.75%        
Term of variable rate 30 days              
Repayment terms One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.              
Percentage of principal payable in installments 50.00%              
Frequency of payment Quarterly              
Term of loan 5 years              
Current portion of long-term debt $ 7,700              
Revolving Credit Facility [Member]                
Long-term Debt [Abstract]                
Balance $ 47,500 [2],[3] 47,500            
Interest rate Variable 30 day: 4.319%              
Interest rate 4.319%     4.319%        
Term of variable rate 30 days              
Repayment terms Revolving line of credit expires October 2019.              
Term of loan 5 years              
South Korea Subsidiary Loan [Member]                
Long-term Debt [Abstract]                
Original principal amount $ 20,000              
Balance $ 0 [2],[3] 10,000            
Interest rate 1.12%     1.12%        
Repayment terms Loan was paid off in March 2017.              
Japan Subsidiary Loan [Member]                
Long-term Debt [Abstract]                
Original principal amount | ¥       ¥ 2.0        
Balance $ 5,900 [2],[3] 11,400   ¥ 0.7 [2],[3] ¥ 1.3      
Interest rate 0.66%     0.66%        
Repayment terms Payable in semi-annual installments over three years that began on January 31, 2016.              
Frequency of payment Semi-annual              
Term of loan 3 years              
Current portion of long-term debt $ 5,900              
Convertible Note [Member]                
Long-term Debt [Abstract]                
Original principal amount 210,000         $ 210,000    
Balance $ 210,000 $ 210,000            
Interest rate 7.10%     7.10%        
Interest rate 4.75%     4.75%        
Repayment terms Principal amount payable on June 15, 2020.              
Unamortized debt discount $ 7,078              
Unamortized debt issuance costs 4,050              
Unamortized debt discount and debt issuance costs 11,100              
Interest expense $ 14,000              
[1] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $13.1 million, which is not reflected in this table.
[2] As of December 31, 2017, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $16.7 million of the balance of its U.S. dollar denominated debt under the Credit Agreement facility, $7.7 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility and $5.9 million of the Japan subsidiary loan. The Company has classified the $47.5 million borrowed under the revolving line of credit as short term because it is the Company's intention to use the line of credit to borrow and pay back funds over short periods of time.
[3] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $9.1 million and debt issuance costs of $4.0 million (consisting of $11.1 million related to the Convertible Note and $2.0 million related to the credit agreement), which is not reflected in this table.