Workers' Compensation Expense (Schedule of Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Oct. 02, 2016	Oct. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Accrued Workers' Compensation [Line Items]
Insurance receivable, current	$ 800
Successor [Member]
Accrued Workers' Compensation [Line Items]
Total obligations	199,752
Less amount included in accrued expenses	15,184
Noncurrent obligations	184,568
Predecessor [Member]
Accrued Workers' Compensation [Line Items]
Total obligations				$ 129,145
Less amount included in accrued expenses				16,875
Noncurrent obligations				112,270
Occupational Disease [Member] | Successor [Member]
Accrued Workers' Compensation [Line Items]
Occupational disease costs	111,159	$ 119,710
Occupational Disease [Member] | Predecessor [Member]
Accrued Workers' Compensation [Line Items]
Occupational disease costs			$ 119,710	90,836	$ 72,749
Workers' Compensation [Member] | Successor [Member]
Accrued Workers' Compensation [Line Items]
Occupational disease costs	$ 88,593
Workers' Compensation [Member] | Predecessor [Member]
Accrued Workers' Compensation [Line Items]
Occupational disease costs				$ 38,309