Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Deferred Revenues (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES Deferred Revenues (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Movement in Deferred Revenue [Roll Forward]      
Balance at beginning of period $ 24,243us-gaap_DeferredRevenue $ 8,953us-gaap_DeferredRevenue $ 123us-gaap_DeferredRevenue
Revenues deferred during period 32,142us-gaap_DeferredRevenueAdditions 37,936us-gaap_DeferredRevenueAdditions 25,908us-gaap_DeferredRevenueAdditions
Revenues recognized during period (25,338)us-gaap_DeferredRevenueRevenueRecognized (22,646)us-gaap_DeferredRevenueRevenueRecognized (17,078)us-gaap_DeferredRevenueRevenueRecognized
Balance at end of period $ 31,047us-gaap_DeferredRevenue $ 24,243us-gaap_DeferredRevenue $ 8,953us-gaap_DeferredRevenue