Statement of Income (Statement) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 143,544,000	$ 182,174,000	$ 460,628,000	$ 526,890,000
Revenues	144,501,000	186,518,000	467,183,000	540,965,000
Labor and Related Expense	103,893,000	130,479,000	329,640,000	371,898,000
General and Administrative Expense	29,769,000	33,093,000	93,970,000	101,646,000
Asset Impairment Charges	0	0	32,970,000	0
Operating Expenses	182,734,000	172,046,000	511,250,000	491,749,000
Operating Income (Loss)	(38,233,000)	14,472,000	(44,067,000)	49,216,000
Interest Income (Expense), Net	(180,000)	819,000	160,000	2,039,000
Other Nonoperating Income (Expense)	1,819,000	(464,000)	460,000	1,887,000
Nonoperating Income (Expense)	1,639,000	355,000	620,000	3,926,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(36,594,000)	14,827,000	(43,447,000)	53,142,000
Income Tax Expense (Benefit)	(10,416,000)	4,880,000	(202,000)	16,828,000
Net Income (Loss) Attributable to Parent	(26,178,000)	9,947,000	(43,245,000)	36,314,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	849,000	(1,337,000)	(1,381,000)	(1,024,000)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	1,000	0	(14,000)	12,000
Other Comprehensive Income (Loss), Net of Tax	850,000	(1,337,000)	(1,395,000)	(1,012,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (25,328,000)	$ 8,610,000	$ (44,640,000)	$ 35,302,000
Weighted Average Number of Shares Outstanding, Basic	19,351,000	19,127,000	19,281,000	19,084,000
Weighted Average Number of Shares Outstanding, Diluted	19,351,000	19,428,000	19,281,000	19,518,000
Earnings Per Share, Basic	$ (1.35)	$ 0.52	$ (2.24)	$ 1.90
Earnings Per Share, Diluted	(1.35)	0.51	(2.24)	1.86
Common Stock, Dividends, Per Share, Declared	$ 0.15	$ 0.15	$ 0.45	$ 0.45
Restructuring Charges	$ 48,115,000	$ 4,130,000	$ 48,115,000	$ 4,130,000
Reimbursements
Revenue from Contract with Customer, Excluding Assessed Tax	957,000	4,344,000	6,555,000	14,075,000
Cost of Goods and Services Sold	$ 957,000	$ 4,344,000	$ 6,555,000	$ 14,075,000