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Intangible Assets and Goodwill (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Summary of cost, accumulated amortization and net book value of intangible assets    
Cost $ 62,046 $ 61,130
Accumulated amortization (48,310) (42,571)
Net book value 13,736 18,559
Aggregate amortization expense 5,651 5,964
Deferred financing costs    
Summary of cost, accumulated amortization and net book value of intangible assets    
Cost 8,537 7,794
Accumulated amortization (5,808) (5,302)
Net book value 2,729 2,492
Customer relationships    
Summary of cost, accumulated amortization and net book value of intangible assets    
Cost 38,428 38,427
Accumulated amortization (30,466) (26,544)
Net book value 7,962 11,883
Technology    
Summary of cost, accumulated amortization and net book value of intangible assets    
Cost 12,092 12,092
Accumulated amortization (9,565) (8,594)
Net book value 2,527 3,498
License    
Summary of cost, accumulated amortization and net book value of intangible assets    
Cost 2,989 2,817
Accumulated amortization (2,471) (2,131)
Net book value $ 518 $ 686