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, 2013
Dec. 31, 2012
Dec. 31, 2011
Movement in Deferred Revenue [Roll Forward]      
Balance at beginning of period $ 8,953 $ 123 $ 216
Revenues deferred during period 37,936 25,908 266
Revenues recognized during period (22,646) (17,078) (359)
Balance at end of period $ 24,243 $ 8,953 $ 123