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Segment Reporting - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting [Abstract]          
Net operating income $ 12,622,000 $ 5,170,000 $ 37,037,000 $ 17,553,000  
General and administrative (6,802,000) (5,020,000) (19,157,000) (15,195,000)  
Depreciation and amortization (17,361,000) (20,256,000) (51,973,000) (53,069,000)  
Interest expense (6,550,000) (7,319,000) (19,519,000) (18,673,000)  
Interest income 1,000 22,000 21,000 262,000  
Acquisition-related expenses (214,000) (483,000) (319,000) (992,000)  
Other expense 56,000 13,000 43,000 (41,000)  
Income from continuing operations 5,915,000 (2,597,000) 17,263,000 (1,891,000)  
Intersegment sales     0   0
Intersegment transfers       $ 0 $ 0