Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment - Schedule of Depreciation, Amortization, Accretion, and Depletion (Details)

v3.19.1
Property, Plant and Equipment - Schedule of Depreciation, Amortization, Accretion, and Depletion (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]                      
Depreciation expense                 $ 107,634 $ 81,191 $ 62,196
Accretion and depletion expense (see Note 2)                 3,539 1,632 1,048
Amortization expense (see Note 8)                 8,704 9,301 9,071
Depreciation, depletion, amortization and accretion $ 30,159 $ 32,015 $ 30,795 $ 26,908 $ 27,770 $ 27,224 $ 19,893 $ 17,237 119,877 92,124 [1] 72,315 [2]
Depreciation expense for assets under capital leases                 $ 500 $ 400 $ 500
[1] Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.
[2] Financial information has been recast to include results attributable to Sturgeon. See Note 4.