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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Deferred Revenue [Roll Forward]      
Balance at beginning of period $ 31,047 $ 24,243 $ 8,953
Revenues deferred during period 32,531 32,142 37,936
Revenues recognized during period (21,446) (25,338) (22,646)
Elimination due to consolidation (42,132) 0 0
Balance at end of period $ 0 $ 31,047 $ 24,243