Long-Term Debt, Credit Agreement (Details) $ in Thousands, ¥ in Billions		12 Months Ended
		Dec. 31, 2016 USD ($)		Dec. 31, 2016 JPY (¥)		Dec. 31, 2015 USD ($)	Dec. 31, 2015 JPY (¥)	Oct. 09, 2014 USD ($)	Oct. 09, 2014 JPY (¥)
Long-term Debt [Abstract]
Outstanding balance	[1]	$ 435,178
Credit Agreement [Member] | Maximum [Member]
Long-term Debt [Abstract]
Consolidated leverage ratio		2.25
Credit Agreement [Member] | Minimum [Member]
Long-term Debt [Abstract]
Consolidated interest coverage ratio		3.00
Term Loan Facility [Member]
Long-term Debt [Abstract]
Original principal amount		$ 127,500						$ 127,500
Term of loan		5 years
Outstanding balance		$ 108,400	[2],[3]			$ 118,700
Japanese Yen Term Loan Facility [Member]
Long-term Debt [Abstract]
Original principal amount | ¥				¥ 6.6					¥ 6.6
Term of loan		5 years
Outstanding balance		$ 47,900	[2],[3]	¥ 5.6	[2],[3]	51,100	¥ 6.1
Revolving Credit Facility [Member]
Long-term Debt [Abstract]
Borrowing capacity								$ 187,500
Term of loan		5 years
Outstanding balance		$ 47,500	[2],[3]			$ 47,500

[1] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $18.3 million, which is not reflected in this table.

[2] As of December 31, 2016, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $13.5 million of the balance of its U.S. dollar denominated debt under the Credit Agreement facility, $6.0 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility, $10.0 million of the Korea subsidiary loan and $5.7 million of the Japan subsidiary loan. The Company has classified the $47.5 million borrowed under the revolving line of credit and the $10.0 million of the Korea subsidiary loan 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 as well as pay off the Korea subsidiary loan in 2017.

[3] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $12.8 million and debt issuance costs of $5.5 million (consisting of $15.1 million related to the Convertible Note and $3.2 million related to the credit agreement), which is not reflected in this table.