Financial Liabilities - Changes in Current and Noncurrent Financial Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financial Liabilities Activity [Roll Forward]
Borrowings, current portion, beginning balance	$ 5,973	$ 8,007
Financial liabilities relating to finance leases, current portion, beginning balance	23	282
Other financial liabilities, current portion, beginning balance	608	488
Derivative instruments, current portion, beginning balance	552	743
Financial liabilities, current portion, beginning balance	7,156	9,520
Borrowings, non current portion, beginning balance	3,272	5,044
Financial liabilities relating to finance leases, non current portion, beginning balance	0	25
Other financial liabilities, non current portion, beginning balance	0	191
Financial liabilities, non current portion, beginning balance	3,272	5,260
Borrowings, beginning balance	9,245	13,051
Financial liabilities relating to finance leases, beginning balance	23	307
Other financial liabilities, beginning balance	608	679
Derivative instruments, beginning balance	552	743
Financial liabilities, beginning balance	10,428	14,780
New borrowings	84,662	4,023
Repayments of financial liabilities	(14,167)	(9,974)
Liabilities assumed in connection with business combinations	7,385	2,796
Other	1,505	208
Currency translation adjustment	(4,233)	(1,405)
Borrowings, current portion, ending balance	5,524	5,973
Financial liabilities relating to finance leases, current portion, ending balance	0	23
Other financial liabilities, current portion, ending balance	477	608
Derivative instruments, current portion, ending balance	1,968	552
Financial liabilities, current portion, ending balance	7,969	7,156
Borrowings, non current portion, ending balance	77,397	3,272
Financial liabilities relating to finance leases, non current portion, ending balance		0
Other financial liabilities, non current portion, ending balance	214	0
Financial liabilities, non current portion, ending balance	77,611	3,272
Borrowings, ending balance	82,921	9,245
Financial liabilities relating to finance leases, ending balance	0	23
Other financial liabilities, ending balance	691	608
Derivative instruments, ending balance	1,968	552
Financial liabilities, ending balance	85,580	10,428
Borrowings
Financial Liabilities Activity [Roll Forward]
New borrowings	84,598	4,023
Repayments of borrowings	(13,854)	(8,716)
Liabilities assumed in connection with business combinations	7,067	1,796
Other	0	324
Currency translation adjustment	(4,135)	(1,233)
Financial liabilities relating to finance leases
Financial Liabilities Activity [Roll Forward]
Repayments of financial liabilities relating to finance leases	(27)	(258)
Liabilities assumed in connection with business combinations	0	0
Other	0	0
Currency translation adjustment	4	(26)
Other financial liabilities
Financial Liabilities Activity [Roll Forward]
New borrowings	64	0
Repayments of other financial liabilities	(286)	(1,000)
Liabilities assumed in connection with business combinations	318	1,000
Other	0	0
Currency translation adjustment	(13)	(71)
Financial derivatives
Financial Liabilities Activity [Roll Forward]
Liabilities assumed in connection with business combinations	0	0
Other	1,505	(116)
Currency translation adjustment	(89)	(75)
Financial liabilities, Current portion
Financial Liabilities Activity [Roll Forward]
New borrowings	5,910	4,023
Repayments of financial liabilities	(14,167)	(9,974)
Liabilities assumed in connection with business combinations	7,385	2,796
Other	2,088	1,681
Currency translation adjustment	(403)	(890)
Financial liabilities, Current portion | Borrowings
Financial Liabilities Activity [Roll Forward]
New borrowings	5,846	4,023
Repayments of borrowings	(13,854)	(8,716)
Liabilities assumed in connection with business combinations	7,067	1,796
Other	808	1,599
Currency translation adjustment	(316)	(736)
Financial liabilities, Current portion | Financial liabilities relating to finance leases
Financial Liabilities Activity [Roll Forward]
Repayments of financial liabilities relating to finance leases	(27)	(258)
Liabilities assumed in connection with business combinations	0	0
Other	0	24
Currency translation adjustment	4	(25)
Financial liabilities, Current portion | Other financial liabilities
Financial Liabilities Activity [Roll Forward]
New borrowings	64	0
Repayments of other financial liabilities	(286)	(1,000)
Liabilities assumed in connection with business combinations	318	1,000
Other	(225)	174
Currency translation adjustment	(2)	(54)
Financial liabilities, Current portion | Financial derivatives
Financial Liabilities Activity [Roll Forward]
Liabilities assumed in connection with business combinations	0	0
Other	1,505	(116)
Currency translation adjustment	(89)	(75)
Financial liablities, Non current portion
Financial Liabilities Activity [Roll Forward]
New borrowings	78,752	0
Repayments of financial liabilities	0	0
Liabilities assumed in connection with business combinations	0	0
Other	(583)	(1,473)
Currency translation adjustment	(3,830)	(515)
Financial liablities, Non current portion | Borrowings
Financial Liabilities Activity [Roll Forward]
New borrowings	78,752	0
Repayments of borrowings	0	0
Liabilities assumed in connection with business combinations	0	0
Other	(808)	(1,275)
Currency translation adjustment	(3,819)	(497)
Financial liablities, Non current portion | Financial liabilities relating to finance leases
Financial Liabilities Activity [Roll Forward]
Repayments of financial liabilities relating to finance leases		0
Liabilities assumed in connection with business combinations		0
Other		(24)
Currency translation adjustment		(1)
Financial liablities, Non current portion | Other financial liabilities
Financial Liabilities Activity [Roll Forward]
New borrowings	0	0
Repayments of other financial liabilities	0	0
Liabilities assumed in connection with business combinations	0	0
Other	225	(174)
Currency translation adjustment	$ (11)	$ (17)