Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table provides a reconciliation of the Level 3 earn-out liability measured at estimated fair value based on an initial valuation and updated quarterly for the year ended December 31, 2017 (in thousands):

	Earn-out Liability
Contingent earn-out liability, December 31, 2016	$	—
Acquisition date fair value estimate of earn-out	19,000
Change in fair value of contingent earn-out (included in income from operations as a separate line item)	8,000
Contingent earn-out liability, December 31, 2017	$	27,000

Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]

The following table provides quantitative information about Level 3 inputs for fair value measurement of our earn-out liability as of the acquisition date and December 31, 2017. Significant increases or decreases in these inputs in isolation could result in a significant impact on our fair value measurement:

Simulation Input	As of December 31, 2017		At Acquisition February 3, 2017
Adjusted EBITDA Volatility	26.00	%	29.00	%
WACC	8.75	%	10.00	%
20-year risk free rate	2.58	%	2.82	%
Market price of risk	5.99	%	6.93	%
Cost of debt	4.08	%	4.16	%

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Our assets and liabilities measured at fair value on a recurring basis consisted of the following (Level 1, 2 and 3 inputs as defined above) (in thousands): 

	Fair value measurements at December 31, 2017
	Total carrying value		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)
Assets:
Available for sale securities:
Short-term	$	10,061	$	—	$	10,061	$	—
Long-term	14,579		—		14,579		—
Total Assets	$	24,640	$	—	$	24,640	$	—
Liabilities:
Earn-out liability	$	27,000	$	—	$	—	$	27,000
Foreign exchange forwards:
Accrued liabilities	187		—		187		—
Other long-term liabilities	402		—		402		—
Total Liabilities	$	27,589	$	—	$	589	$	27,000

Fair Value Measurements, Nonrecurring [Table Text Block]

Our assets measured at fair value on a nonrecurring basis consisted of the following (Level 1, 2 and 3 inputs as defined above (in thousands):

	Fair value measurements at December 31, 2017 using
	Total carrying value		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)
Assets:
Assets held-for-sale	$	12,489	$	—	$	—	$	12,489
Total Assets	$	12,489	$	—	$	—	$	12,489