Changes in the Company's carrying value of other intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite-Live Intangible Assets, Net Adjustments During Period		$ 0
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross, Beginning	$ 16,522	18,742
Intangible Asssets, Gross, Excluding Goodwill, Beginning	18,687	20,907
Finite-Lived Intangible Assets, Accumulated Amortization, Beginning	(6,263)	(5,750)
Finite-lived Intangible Assets Acquired	11,442
Intangible Assets, Net Adjustments During Period	11,442	0
Amortization of Intangible Assets	(3,415)	(1,497)	$ (1,600)
Impaiment		(1,236)
Translation	(24)
Finite-Lived Intangible Assets, Gross, Ending	27,938	16,522	18,742
Intangible Asssets, Gross, Excluding Goodwill, Ending	30,103	18,687	20,907
Finite-Lived Intangible Assets, Accumulated Amortization, Ending	(9,676)	(6,263)	(5,750)
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Transferred From Indefinite Lived		0
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross, Beginning	5,100	5,200
Indefinite-lived trademarks	2,165	2,165	2,165
Finite-Lived Intangible Assets, Accumulated Amortization, Beginning	(680)	(440)
Finite-lived Intangible Assets Acquired	1,340
Indefinite-Lived Intangible Assets, Transferred Fo Finite Lived	0	0
Amortization of Intangible Assets	(374)	(340)
Impaiment		0
Translation	0
Finite-Lived Intangible Assets, Gross, Ending	6,440	5,100	5,200
Indefinite-Lived Trademarks, ending	(2,165)	(2,165)	(2,165)
Finite-Lived Intangible Assets, Accumulated Amortization, Ending	(1,054)	(680)	(440)
Developed Technology [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross, Beginning	0	460
Finite-Lived Intangible Assets, Accumulated Amortization, Beginning	0	(276)
Finite-lived Intangible Assets Acquired	0
Amortization of Intangible Assets	0	(92)
Impaiment		(92)
Translation	0
Finite-Lived Intangible Assets, Gross, Ending	0	0	460
Finite-Lived Intangible Assets, Accumulated Amortization, Ending	0	0	(276)
Client Relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross, Beginning	10,300	11,960
Finite-Lived Intangible Assets, Accumulated Amortization, Beginning	(5,047)	(4,625)
Finite-lived Intangible Assets Acquired	10,102
Amortization of Intangible Assets	(2,929)	(938)
Impaiment		(1,144)
Translation	(24)
Finite-Lived Intangible Assets, Gross, Ending	20,376	10,300	11,960
Finite-Lived Intangible Assets, Accumulated Amortization, Ending	(7,974)	(5,047)	(4,625)
Noncompete Agreements [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross, Beginning	150	150
Finite-Lived Intangible Assets, Accumulated Amortization, Beginning	(135)	(105)
Finite-lived Intangible Assets Acquired	0
Amortization of Intangible Assets	(15)	(30)
Impaiment		0
Translation	0
Finite-Lived Intangible Assets, Gross, Ending	150	150	150
Finite-Lived Intangible Assets, Accumulated Amortization, Ending	(150)	(135)	(105)
Franchise Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Payments to Acquire Intangible Assets		0
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross, Beginning	972	972
Finite-Lived Intangible Assets, Accumulated Amortization, Beginning	(401)	(304)
Finite-lived Intangible Assets Acquired	0
Amortization of Intangible Assets	(97)	(97)
Impaiment		0
Translation	0
Finite-Lived Intangible Assets, Gross, Ending	972	972	972
Finite-Lived Intangible Assets, Accumulated Amortization, Ending	$ (498)	$ (401)	$ (304)