Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	$ 61,130	$ 60,855
Accumulated amortization	(42,571)	(36,607)
Net book value	18,559us-gaap_FiniteLivedIntangibleAssetsNet	24,248us-gaap_FiniteLivedIntangibleAssetsNet
Aggregate amortization expense	5,964us-gaap_AmortizationOfDeferredCharges	6,208us-gaap_AmortizationOfDeferredCharges
Deferred financing costs [Member]
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	7,794	7,794
Accumulated amortization	(5,302)	(4,507)
Net book value	2,492	3,287
Customer relationships [Member]
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	38,427	38,427
Accumulated amortization	(26,544)	(22,624)
Net book value	11,883	15,803
Technology [Member]
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	12,092	12,092
Accumulated amortization	(8,594)	(7,626)
Net book value	3,498	4,466
License [Member]
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	2,755	2,480
Accumulated amortization	(2,096)	(1,828)
Net book value	659	652
Trade name [Member]
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	62	62
Accumulated amortization	(35)	(22)
Net book value	$ 27	$ 40

The amount of amortization of deferred charges applied against earnings during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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