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Subsequent Events (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 15, 2019
Feb. 14, 2019
Nov. 14, 2018
Aug. 14, 2018
May 15, 2018
Feb. 14, 2018
Nov. 14, 2017
Aug. 14, 2017
May 15, 2017
Feb. 14, 2017
Nov. 14, 2016
Aug. 12, 2016
May 16, 2016
Feb. 16, 2016
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event                                      
Income from extinguishment of contingent liability                             $ (52,600) $ 16,200 $ (52,627) $ 16,194  
Cash distributions     $ 16,325 $ 16,325 $ 15,829 $ 15,829 $ 15,829 $ 15,829 $ 15,829 $ 15,829 $ 15,829 $ 15,829 $ 15,829 $ 15,829     $ 66,139 $ 63,316 $ 63,316
Subsequent event | Series A Preferred Limited Partners                                      
Subsequent Event                                      
Cash distributions $ 1,700                                    
Subsequent event | Common Limited Partners                                      
Subsequent Event                                      
Cash distributions   $ 17,300