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Acquisitions Pro Forma Results (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pro Forma [Abstract]                      
Revenue, Net $ (80,633) $ (75,651) $ (75,006) $ (74,617) $ (67,315) $ (70,199) $ (69,348) $ (69,711) $ (305,907) $ (276,573) $ (275,834)
Business Acquisition, Pro Forma Revenue                 331,522 308,250 283,573
Net Income (Loss) Attributable to Parent $ 20,237 $ 1,321 $ 7,273 $ 857 $ (4,643) $ 1,825 $ 172 $ 1,017 $ 29,688 (1,629) 297
Business Acquisition, Pro Forma Net Income (Loss)                   $ (1,148) $ 317