Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The components of our borrowings are as follows:

	December 31, 2017		December 31, 2016
	(in thousands)
Credit Facilities
USD denominated term loan	$	194,063	$	208,125
Multicurrency revolving line of credit	125,414		97,167
Senior notes	300,000		—
Total debt	619,477		305,292
Less: current portion of debt	19,688		14,063
Less: unamortized prepaid debt fees - term loan	629		769
Less: unamortized prepaid debt fees - senior notes	5,588		—
Long-term debt	$	593,572	$	290,460

Schedule of Maturities of Long-term Debt [Table Text Block]

Required minimum principal payments on our outstanding credit facilities are as follows:

Year Ending December 31,	Minimum Payments
	(in thousands)
2018	$	19,688
2019	22,500
2020	277,289
2021	—
2022	—
Total minimum payments on debt	$	319,477

Schedule of Long-Term Debt Repayments [Table Text Block]

Total credit facility repayments were as follows:

	Year Ended December 31,
	2017		2016		2015
	(in thousands)
Term loan	$	14,063	$	11,250	$	13,125
Multicurrency revolving line of credit	15,000		67,869		49,873
Total credit facility repayments	$	29,063	$	79,119	$	62,998