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Consolidated Statements of Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Revenues, Net From Related Parties $ 6,475 $ 7,545 $ 21,689 $ 23,813
Technical and operating charges from related parties 0 14 0 324
Related Party Transaction, Expenses from Transactions with Related Party $ 928 $ 510 $ 2,477 $ 2,732