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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Our financial assets and (liabilities) carried at fair value measured on a recurring basis as of September 30, 2018 and December 31, 2017, consisted of the following (in thousands):
Fair Value Measurements Using 
Total Fair Quoted prices in Significant other Significant 
Value at active markets observable inputs unobservable inputs 
Description September 30, 2018(Level 1) (Level 2) (Level 3) 
Interest rate contracts (1)
$8,284 $— $8,284 $— 
Foreign currency contract assets, current and long-term (2)
$1,334 $— $1,334 $— 
Foreign currency contract liabilities, current and long-term (3)
$(771)$— $(771)$— 
Fair Value Measurements Using 
Total Fair Quoted prices in Significant other Significant 
Value at active markets observable inputs unobservable inputs 
Description December 31, 2017(Level 1) (Level 2) (Level 3) 
Interest rate contracts (1)
$5,749 $— $5,749 $— 
Foreign currency contract assets, current and long-term (2)
$621 $— $621 $— 
Foreign currency contract liabilities, current and long-term (3)
$(1,391)$— $(1,391)$— 
(1)  The fair value of the interest rate contracts is determined using Level 2 fair value inputs and is recorded as other assets or other long-term obligations in the consolidated balance sheets.
(2)  The fair value of the foreign currency contract assets (including those designated as hedging instruments and those not designated as hedging instruments) is determined using Level 2 fair value inputs and is recorded as prepaid expenses and other assets or other long-term assets in the consolidated balance sheets.
(3)  The fair value of the foreign currency contract liabilities (including those designated as hedging instruments and those not designated as hedging instruments) is determined using Level 2 fair value inputs and is recorded as accrued expenses or other long-term obligations in the consolidated balance sheets.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Changes in the fair value of our contingent consideration liability during the three and nine-month periods ended September 30, 2018 and 2017, consisted of the following (in thousands):
Three Months Ended September 30, Nine Months Ended September 30, 
2018201720182017
Beginning balance $10,912 $5,572 $10,956 $683 
Contingent consideration liability recorded as the result of acquisitions (see Note 5) — 5,500 — 10,400 
Fair value adjustments recorded to income during the period (828)20 (741)39 
Contingent payments made (53)(15)(184)(45)
Ending balance $10,031 $11,077 $10,031 $11,077 
Fair Value Inputs, Liabilities, Quantitative Information
The recurring Level 3 measurement of our contingent consideration liability and contingent receivable includes the following significant unobservable inputs at September 30, 2018 and December 31, 2017 (amounts in thousands):

Contingent consideration asset or liability Fair Value at
September 30, 2018		Valuation technique Unobservable inputs Range 
Revenue-based payments $10,031 Discounted cash flow Discount rate 9.9% - 15% 
contingent liability Projected year of payments 2018-2037 
Contingent receivable $308 Discounted cash flow Discount rate 10%  
asset Weighted-average probability of milestone payment 35%  
Projected year of payments 2018-2019
Contingent consideration asset or liability Fair Value at December 31, 2017 Valuation technique Unobservable inputs Range 
Revenue-based payments $10,956 Discounted cash flow Discount rate 9.9% - 15% 
contingent liability Probability of milestone payment 100%  
Projected year of payments 2018-2037
Contingent receivable $760 Discounted cash flow Discount rate 10%  
asset Weighted-average probability of milestone payment 75%  
Projected year of payments 2018-2019