Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill, Gross
Balance, beginning of period			$ 58,397
Additions			152,713
Purchase accounting adjustments			(2,048)
Foreign currency fluctuations			13,736
Balance, end of period	$ 222,798		222,798		$ 58,397
Accumulated Impairment Losses
Balance, beginning of period			(37,332)
Foreign currency fluctuations			(2,216)
Balance, end of period	(39,548)		(39,548)		(37,332)
Goodwill, Net
Balance, beginning of period			21,065
Additions			152,713
Purchase accounting adjustments			(2,048)
Foreign currency fluctuations			11,520
Balance, end of period	183,250		183,250		21,065
Acquired Finite-lived Intangible Assets
Original cost	179,128		179,128		15,152
Accumulated amortization	(12,930)		(12,930)		(8,692)
Intangible Assets, Net	166,198		166,198		6,460
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	148,744		148,744
Purchase of Intangible Assets			$ 2,500	$ 0
Finite-Lived Intangible Asset, Useful Life			5 years
Amortization expense	3,536	$ 112	$ 3,780	$ 224
Estimated aggregate amortization expense of Intangible Assets
Remaining 2017	7,043		7,043
2018	14,085		14,085
2019	12,801		12,801
2020	12,374		12,374
2021	12,374		12,374
Thereafter	107,521		107,521
Total	166,198		166,198
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	136,503		136,503		8,016
Accumulated amortization	(8,697)		(8,697)		(5,948)
Intangible Assets, Net	127,806		$ 127,806		$ 2,068
Weighted-average original life			15 years		15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	33,954		$ 33,954		$ 2,000
Accumulated amortization	(823)		(823)		0
Intangible Assets, Net	33,131		$ 33,131		$ 2,000
Weighted-average original life			11 years		15 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	5,247		$ 5,247		$ 5,136
Accumulated amortization	(2,982)		(2,982)		(2,744)
Intangible Assets, Net	2,265		$ 2,265		$ 2,392
Weighted-average original life			14 years		13 years
Noncompete Agreement
Acquired Finite-lived Intangible Assets
Original cost	3,424		$ 3,424		$ 0
Accumulated amortization	(428)		(428)		0
Intangible Assets, Net	$ 2,996		$ 2,996		$ 0
Weighted-average original life			2 years		0 years