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Unconsolidated Equity Method Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Unconsolidated equity method investment $ 49,131   $ 49,131   $ 46,453
Customer Advances and Deposits 338,515   338,515   333,456
Earnings of unconsolidated equity method investment, net of tax $ 1,557 $ 927 4,563 $ 1,898  
Distributions from unconsolidated equity method investment in excess of earnings     $ 0 $ (997)  
Related Party Transaction, Percentage Ownership of Company Outstanding Shares 9.70%   9.70%    
Equity Method Investee | OTTP          
Unconsolidated equity method investment $ 49,131   $ 49,131   $ 46,453
Equity Method Investment, Ownership Percentage 30.00%   30.00%    
Equity Method Investments Before Earnings     $ 2,994    
Earnings of unconsolidated equity method investment, net of tax     4,563    
Distributions from unconsolidated equity method investment in excess of earnings     (4,879)    
Maintenance Payments {Member] | Equity Method Investee | OTTP          
Customer Advances and Deposits $ 6,270   6,270    
security deposit [Member] | Equity Method Investee | OTTP          
Customer Advances and Deposits $ 5,400   $ 5,400