Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Instruments Not Carried at Fair Value (Details)

v3.19.1
Fair Value Measurements - Schedule of Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long term debt, including current portion:    
Carrying value $ 1,816,450 $ 1,718,297
Fair value $ 1,218,606 $ 1,645,616