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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of the change in the balance of the Company's asset measured at fair value on a recurring basis using significant unobservable inputs (Level 3)      
Balance, beginning of period $ 62
Total losses (realized or unrealized) included in earnings in "Direct cost of revenues" $ (62) $ (142)
Purchases, sales, issuances and settlements:      
Purchases 359
Settlement (155)
Balance, end of period 62
The amount of total gains for the period included in earnings in ''Direct cost of revenues'' attributable to the change in unrealized gains or losses relating to assets held at the end of the period $ 62