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Consolidated Statement of Member's Equity (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Consolidated Statement of Equity [Roll Forward]  
Beginning balance $ 267,025us-gaap_StockholdersEquity
Net income 4,975us-gaap_NetIncomeLoss
Ending balance $ 272,000us-gaap_StockholdersEquity