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Areas of Operation (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Areas of Operation        
Revenues   $ 133,330,000 $ 234,685,000 $ 261,683,000
Long-lived assets   110,917,000 147,567,000  
U.S.        
Areas of Operation        
Revenues $ 50,802,000 122,522,000 222,154,000 256,110,000
Long-lived assets   105,059,000 136,758,000  
Canada        
Areas of Operation        
Revenues   10,808,000 12,531,000 $ 5,573,000
Long-lived assets   $ 5,858,000 $ 10,809,000