Debtor in Possession - Condensed Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	$ 151,890	$ 160,370
Direct expenses	156,874	156,226
Selling, general and administrative expenses	24,869	15,459
Total operating expenses	181,743	171,685
Loss on disposal of assets	51	879
Equity in (income) loss of unconsolidated affiliates, net	(1,361)	37
Operating (loss) income	(28,543)	(12,231)
Interest expense	8,166	8,197
Reorganization items, net	1,600	0
Other income – net	40	1,045
Total expenses	9,806	9,242
Loss before income taxes	(38,349)	(21,473)
Income tax benefit	(3,108)	(4,490)
Net loss	(35,241)	$ (16,983)
Phi, Inc. and Debtors [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	126,662
Direct expenses	137,049
Selling, general and administrative expenses	21,482
Total operating expenses	158,531
Loss on disposal of assets	51
Equity in (income) loss of unconsolidated affiliates, net	(1,361)
Operating (loss) income	(30,559)
Interest expense	8,166
Reorganization items, net	1,600
Other income – net	(184)
Total expenses	9,582
Loss before income taxes	(40,141)
Income tax benefit	(3,605)
Net loss	$ (36,536)