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Debt, Debt Facilities (Details)
$ in Thousands, ¥ in Billions
 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
JPY (¥)
Apr. 18, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JPY (¥)
Jun. 16, 2016
USD ($)
Oct. 09, 2014
USD ($)
Oct. 09, 2014
JPY (¥)
Debt [Abstract]                
Current portion of debt $ 97,481     $ 77,840        
Unamortized debt issuance costs 4,500     4,000        
Unamortized debt discount       9,100        
October 2014 Credit Agreement Term Loan Facility [Member]                
Debt [Abstract]                
Original principal amount 127,500           $ 127,500  
Balance $ 0     94,800 [1]        
Interest rate Variable 30 day: 4.627%              
Interest rate 4.627% 4.627%            
Term of variable rate 30 days              
Repayment terms Principal amount was paid in full during April 2018.              
Term of loan 5 years              
Current portion of debt $ 20,000              
October 2014 Credit Agreement Japanese Yen Term Loan Facility [Member]                
Debt [Abstract]                
Original principal amount | ¥   ¥ 6.6           ¥ 6.6
Balance $ 0 ¥ 0.0   43,500 [1] ¥ 4.9 [1]      
Interest rate Variable 30 day: 2.7595%              
Interest rate 2.7595% 2.7595%            
Term of variable rate 30 days              
Repayment terms Principal amount was paid in full during April 2018.              
Term of loan 5 years              
October 2014 Credit Agreement Revolving Credit Facility [Member]                
Debt [Abstract]                
Balance $ 0     47,500 [1]        
Interest rate Variable 30 day: 4.594%              
Interest rate 4.594% 4.594%            
Term of variable rate 30 days              
Repayment terms Principal amount was paid in full during April 2018 and credit line was closed.              
Term of loan 5 years              
April 2018 Credit Agreement Term Loan Facility [Member]                
Debt [Abstract]                
Original principal amount $ 400,000   $ 400,000          
Balance $ 395,000 [1],[2]     0        
Interest rate Variable 30 day: 4.344%              
Interest rate 4.344% 4.344%            
Term of variable rate 30 days              
Repayment terms 35% of the principal amount is payable in increasing quarterly installments over a five-year period beginning on June 30, 2018, with the remainder payable at the end of the five-year term.              
Percentage of principal payable in installments 35.00%              
Frequency of payment Quarterly              
Term of loan 5 years              
April 2018 Credit Agreement Revolving Credit Facility [Member]                
Debt [Abstract]                
Balance $ 74,500 [1],[2]     0        
Interest rate Variable 30 day: 4.344%              
Interest rate 4.344% 4.344%            
Term of variable rate 30 days              
Repayment terms Revolving line of credit expires April 18, 2023.              
Term of loan 5 years              
Japan Subsidiary Loan [Member]                
Debt [Abstract]                
Original principal amount | ¥   ¥ 2.1            
Balance $ 3,000 ¥ 0.3   5,900 ¥ 0.7      
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 debt $ 3,000              
Convertible Note [Member]                
Debt [Abstract]                
Original principal amount 210,000         $ 210,000    
Balance $ 0     210,000 [1]        
Interest rate 7.10% 7.10%            
Interest rate 4.75% 4.75%            
Repayment terms Principal amount was paid in full during April 2018.              
Unamortized debt discount and debt issuance costs       11,100        
Credit Agreement [Member]                
Debt [Abstract]                
Unamortized debt discount and debt issuance costs       $ 2,000        
[1] The carrying value of the debt reflects the amounts stated in the above table less debt issuance costs of $4.5 million as of June 30, 2018 related to the credit agreement; and 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) as of December 31, 2017, which is not reflected in this table.
[2] As of June 30, 2018, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $20.0 million of the balance of its U.S. dollar denominated debt under the New Credit Agreement facility and $3.0 million of the Japan subsidiary loan. The Company has classified the $78.5 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.