Goodwill and Other Intangible Assets (Schedule of Changes in Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Dec. 31, 2016
Amortized intangible assets:
Gross carrying value			$ 71,901	$ 71,901
Accumulated amortization			8,985	5,447
Net carrying amount	$ 62,916	$ 66,454	62,916	66,454
Beginning balance	66,454
Amortization	(3,538)
Currency Translation
Ending balance	62,916	66,454
Goodwill
Beginning balance	160,375
Amortization
Currency Translation	3,953
Ending balance	164,328	160,375
AEC Trade Names [Member]
Amortized intangible assets:
Gross carrying value			43	43
Accumulated amortization			25	23
Net carrying amount	20	20	18	20
Beginning balance	20
Amortization	(2)
Currency Translation
Ending balance	$ 18	$ 20
Goodwill
Amortization life in years	15 years	15 years
AEC Technology [Member]
Amortized intangible assets:
Gross carrying value			228	228
Accumulated amortization			136	124
Net carrying amount	$ 104	$ 104	92	104
Beginning balance	104
Amortization	(12)
Currency Translation
Ending balance	$ 92	$ 104
Goodwill
Amortization life in years	15 years	15 years
Customer Relationships [Member]
Amortized intangible assets:
Gross carrying value			49,490	49,490
Accumulated amortization			4,131	2,481
Net carrying amount	$ 45,359	$ 47,009	45,359	47,009
Beginning balance	47,009
Amortization	(1,650)
Currency Translation
Ending balance	$ 45,359	$ 47,009
Goodwill
Amortization life in years	15 years	15 years
Customer Contracts [Member]
Amortized intangible assets:
Gross carrying value			20,420	20,420
Accumulated amortization			4,263	2,561
Net carrying amount	$ 16,157	$ 17,859	16,157	17,859
Beginning balance	17,859
Amortization	(1,702)
Currency Translation
Ending balance	$ 16,157	$ 17,859
Goodwill
Amortization life in years	6 years	6 years
Other Intangible Assets [Member]
Amortized intangible assets:
Gross carrying value			1,720	1,720
Accumulated amortization			430	258
Net carrying amount	$ 1,290	$ 1,462	$ 1,290	1,462
Beginning balance	1,462
Amortization	(172)
Currency Translation
Ending balance	$ 1,290	$ 1,462
Goodwill
Amortization life in years	5 years	5 years
MC Goodwill [Member]
Goodwill
Gross carrying value				64,645
Beginning balance	$ 64,645
Amortization
Currency Translation	3,953
Ending balance	68,598	$ 64,645
AEC Goodwill [Member]
Goodwill
Gross carrying value				$ 95,730
Beginning balance	95,730
Amortization
Currency Translation
Ending balance	$ 95,730	$ 95,730