Long-Term Debt (Details) $ in Thousands, ¥ in Billions		12 Months Ended
		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Dec. 31, 2013 USD ($)	Dec. 31, 2015 JPY (¥)	Dec. 31, 2014 JPY (¥)
Long-term Debt [Abstract]
Current portion of long-term debt		$ 67,849		$ 82,770
Debt discount		4,300
Interest expense		7,900		5,700		$ 3,000
Maturities of Long-term Debt [Abstract]
2016		67,849
2017		34,905
2018		39,481
2019		111,664
2020		0
Thereafter		0
Total	[1]	$ 253,899
Maximum [Member]
Long-term Debt [Abstract]
Consolidated leverage ratio		2.25
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
Balance	[1],[2]	$ 118,700		125,900
Interest rate		Variable 30 day: 2.4815%
Interest rate		2.4815%					2.4815%
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.
Term of variable rate		30 days
Percentage of principal payable in installments		50.00%
Frequency of payment		Quarterly
Current portion of long-term debt		$ 57,800
Japanese Yen Term Loan Facility [Member]
Long-term Debt [Abstract]
Original principal amount		$ 51,100	[1],[2]	54,400	[1],[2]		¥ 6.6
Balance | ¥	[1],[2]						¥ 6.1	¥ 6.5
Interest rate		Variable 30 day: 2.30%
Interest rate		2.30%					2.30%
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.
Term of variable rate		30 days
Percentage of principal payable in installments		50.00%
Frequency of payment		Quarterly
Current portion of long-term debt		$ 4,500
Revolving Credit Facility [Member]
Long-term Debt [Abstract]
Borrowing capacity		$ 187,500
Term of loan		5 years
Balance	[1],[2]	$ 47,500		72,500
Interest rate		Variable 30 day: 2.4815%
Interest rate		2.4815%					2.4815%
Repayment terms		Revolving line of credit expires October 2019.
Term of variable rate		30 days
Korean Subsidiary Loan [Member]
Long-term Debt [Abstract]
Original principal amount		$ 20,000
Balance	[1],[2]	$ 20,000		0
Interest rate		1.12%					1.12%
Repayment terms		One half of the principal amount payable on March 17, 2017 and the remainder payable on March 16, 2018.
Percentage of principal payable in installments		50.00%
Japan Subsidiary Loan [Member]
Long-term Debt [Abstract]
Term of loan		3 years
Original principal amount | ¥							¥ 2.0
Balance	[1],[2]	$ 16,600		$ 0			¥ 2.0
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
Current portion of long-term debt		$ 5,000

[1] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $4.3 million, which is not reflected in this table.

[2] As of December 31, 2015, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $57.8 million of the balance of its U.S. dollar denominated debt under the Credit Agreement facility, $4.5 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility and $5.5 million of the Japan subsidiary loan. The Company has classified the amounts 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.