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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]        
Net income $ 30,942 $ 29,590 $ 89,992 $ 69,633
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 15,925 16,285 48,485 47,289
Amortization 2,289 1,997 6,862 7,017
Change in deferred taxes and other liabilities 1,606 3,074 7,022 12,434
Impairment of property, plant and equipment 25 303 563 536
Non-cash interest expense 283 (309) 593 (138)
Compensation and benefits paid or payable in Class A Common Stock 606 80 2,232 596
Provision for credit losses from uncollected receivables and contract assets (1,075) (105) (1,158) 1,664
Foreign currency remeasurement loss/(gain) on intercompany loans 480 169 (551) 15,750
Fair value adjustment on foreign currency options 29 (64) 169 0
Changes in operating assets and liabilities that provided/(used) cash:        
Accounts receivable (10,927) (2,048) (14,292) 6,069
Contract assets (3,473) (7,923) 22,170 (27,932)
Inventories 546 4,585 (9,838) (20,043)
Prepaid expenses and other current assets 3,949 (4,532) 2,444 (6,989)
Income taxes prepaid and receivable 2,717 (454) 2,408 (662)
Accounts payable (296) (5,108) 4,312 (15,491)
Accrued liabilities 5,112 2,838 (12,311) (8,063)
Income taxes payable 2,871 1,786 (1,085) 3,741
Noncurrent receivables 1,245 (228) 2,832 169
Other noncurrent liabilities (1,319) 111 (5,582) (413)
Other, net 1,324 (388) 3,232 (1,474)
Net cash provided by operating activities 52,859 39,659 148,499 83,693
INVESTING ACTIVITIES        
Purchases of property, plant and equipment (8,918) (9,349) (31,754) (31,320)
Purchased software (106) (109) (394) (155)
Net cash used in investing activities (9,024) (9,458) (32,148) (31,475)
FINANCING ACTIVITIES        
Proceeds from borrowings 0 0 8,000 70,000
Principal payments on debt 0 (17,005) (56,009) (76,016)
Principal payments on finance lease liabilities (363) (335) (1,067) (6,798)
Taxes paid in lieu of share issuance 0 0 (998) (490)
Proceeds from options exercised 4 5 153 25
Dividends paid (6,476) (6,144) (19,418) (18,424)
Net cash used in financing activities (6,835) (23,479) (69,339) (31,703)
Effect of exchange rate changes on cash and cash equivalents (4,113) 4,545 (2,111) (751)
Increase in cash and cash equivalents 32,887 11,267 44,901 19,764
Cash and cash equivalents at beginning of period 253,330 204,037 241,316 195,540
Cash and cash equivalents at end of period $ 286,217 $ 215,304 $ 286,217 $ 215,304