CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (88,435)	$ (18,221)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	15,285	13,188
Deferred income taxes	(15,799)	(9,098)
Loss from discontinued operations	454	287
Restructuring charges	851	688
Legal settlement		8,500
Impairment charges	88,380
Gains on dispositions of property and other assets	(85)	(551)
Share-based compensation (benefit) expense	(2,145)	2,206
Other non-cash items, net	9,342	1,041
Change in operating assets and liabilities:
Receivables	15,651	(25,545)
Inventories	(711)	(874)
Current contract costs	8,970	(4,838)
Accounts payable	(1,109)	12,868
Restructuring liabilities	(1,293)	(714)
Accrued compensation	(20,551)	(7,490)
Contract liabilities	(12,602)	32,379
Payments on operating lease obligations	(6,529)	(6,198)
Income taxes payable	17,753	6
Other assets and liabilities, net	(12,146)	10,386
Net cash (used in) provided by operating activities	(4,719)	8,020
Cash flows from investing activities
Capital expenditures	(23,246)	(19,543)
Proceeds from dispositions of property and other assets	85	611
Net cash used in investing activities	(23,161)	(18,932)
Cash flows from financing activities
Proceeds from borrowings	160,755	28,347
Payments on debt and finance lease obligations	(56,077)	(14,376)
Dividends paid on common stock	(2,038)	(2,028)
Distributions to noncontrolling interest	(1,526)
Payment of payroll taxes on stock-based compensation through shares withheld or repurchased	(1,059)	(2,905)
Common stock purchased for treasury	(2,785)
Proceeds from exercise of stock options	2,077
Net cash provided by financing activities	99,347	9,038
Effect of exchange rate changes on cash and cash equivalents	(2,938)	454
Net change in cash and cash equivalents	68,529	(1,420)
Cash and cash equivalents, beginning of year	61,999	44,893	$ 44,893
Cash and cash equivalents, end of period	$ 130,528	$ 43,473	$ 61,999