Senior debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Summary of Debt

Debt consisted of the following at December 31, 2015 and 2014:

(Table only in thousands)	December 31, 2015			December 31, 2014
Outstanding borrowings under Credit Facility (defined below).    Term loan payable in quarterly principal installments of $3.2    million through September 2017, $4.3 million through    September 2018, and $5.3 million thereafter with balance    due upon maturity in September 2020.
– Term loan	$	166,813		$	90,072
– U.S. Dollar revolving loans		8,000			24,000
– Multi-currency revolving loans		—			—
– Unamortized debt discount		(4,229	)		(2,368	)
Total outstanding borrowings under Credit Facility		170,584			111,704
Outstanding borrowings (U.S. dollar equivalent) under    China Facility (defined below)		1,391			—
Outstanding borrowings (U.S. dollar equivalent) under    Aarding Facility (defined below)		5,326			—
Outstanding borrowings (U.S. dollar equivalent) under    Euro-denominated note payable to a bank, payablein    quarterly installments of €25,000 ($27,000 as of    December 31, 2015), plus interest, at a fixed rate of 3.82%,    maturing January2016. Collateralized by the Heerenveen,    Netherlands building.		27			152
Total outstanding borrowings	$	177,328		$	111,856
Less: current portion		19,494			8,887
Total debt, less current portion	$	157,834		$	102,969