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Areas of Operation (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2014
Sep. 30, 2013
Areas of Operation        
Revenues   $ 234,685,000 $ 261,683,000 $ 305,299,000
Long-lived assets   147,567,000 164,494,000  
U.S.        
Areas of Operation        
Revenues $ 50,802,000 222,154,000 256,110,000 303,869,000
Long-lived assets   136,758,000 163,880,000  
Canada        
Areas of Operation        
Revenues   12,531,000 5,573,000 $ 1,430,000
Long-lived assets   $ 10,809,000 $ 614,000