Goodwill and Intangibles Estimated Intangible Asset Amortization Expense (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
January 1, 2017 through March 31, 2017	$ 2,216
2018	5,365
2019	5,112
2020	4,985
2021	4,737
Later	24,902
Amortizable Intangibles, Net	47,317
Customer Relationships Intangible
Finite-Lived Intangible Assets [Line Items]
January 1, 2017 through March 31, 2017	835
2018	3,340
2019	3,340
2020	3,340
2021	3,340
Later	23,506
Amortizable Intangibles, Net	37,701
Production and Supply Contract Intangibles
Finite-Lived Intangible Assets [Line Items]
January 1, 2017 through March 31, 2017	1,097
2018	1,405
2019	1,405
2020	1,397
2021	1,397
Later	1,396
Amortizable Intangibles, Net	8,097
Internally Developed Software Intangible
Finite-Lived Intangible Assets [Line Items]
January 1, 2017 through March 31, 2017	284	[1]
2018	620	[1]
2019	367	[1]
2020	248	[1]
2021	0	[1]
Later	0	[1]
Amortizable Intangibles, Net	$ 1,519	[1]

[1] Estimated amortization expense for the internally developed software is based on costs accumulated as of December 31, 2016. These estimates will change as new costs are incurred and until the software is placed into service in all locations.