Debtor in Possession - Condensed Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	$ 165,172		$ 169,243	$ 317,062	$ 329,607
Direct expenses	153,514		155,083	310,390	311,309
Selling, general and administrative expenses	17,591		14,485	42,458	29,944
Total operating expenses	171,105		169,568	352,848	341,253
(Gain) loss on disposal of assets	(95)		(171)	(44)	708
Equity in (income) loss of unconsolidated affiliate, net	(1,039)		(81)	(2,400)	(45)
Operating loss	(4,799)		(73)	(33,342)	(12,309)
Interest expense	3,927		8,340	12,093	16,537
Reorganization items, net	26,503	$ 1,600		28,103
Other income – net	(333)		364	(293)	1,404
Total expenses	30,097		8,704	39,903	17,941
Loss before income taxes	(34,896)		(8,777)	(73,245)	(30,250)
Income tax benefit	(2,819)		(1,684)	(5,927)	(6,175)
Net loss	(32,077)		$ (7,093)	(67,318)	$ (24,075)
Phi, Inc. and Debtors [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues, net	139,501			266,164
Direct expenses	129,319			266,368
Selling, general and administrative expenses	14,746			36,228
Total operating expenses	144,065			302,596
(Gain) loss on disposal of assets	(93)			(42)
Equity in (income) loss of unconsolidated affiliate, net	(1,039)			(2,400)
Operating loss	(3,432)			(33,990)
Interest expense	3,927			12,093
Reorganization items, net	26,503			28,103
Other income – net	(42)			(226)
Total expenses	30,388			39,970
Loss before income taxes	(33,820)			(73,960)
Income tax benefit	(2,443)			(6,048)
Net loss	$ (31,377)			$ (67,912)