Borrowing Arrangements - Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Long-term Debt
Total Long-Term Debt	$ 102,294	$ 111,441
Less Current Portion of Long-Term Debt	(7,500)	(7,500)
Long-Term Debt	94,794	103,941
U.S. Credit Agreement
Long-term Debt
Total Long-Term Debt	96,375	107,700
Japanese Credit Agreement
Long-term Debt
Total Long-Term Debt	$ 5,919
Japanese Term Loan due May 2017
Long-term Debt
Total Long-Term Debt		$ 3,741