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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities:      
Net income $ 37,506 $ 41,899 $ 35,227
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 44,246 50,638 44,972
Deferred income taxes 3,617 6,699 5,135
Stock based compensation 6,253 9,047 12,507
Defined benefit plan (income) expense (570) 82 (23)
Provision of doubtful accounts 353 (1) (469)
Loss on sale of property and equipment 462 2,602 1,042
Operating lease expense 6,173    
Asset impairments and net loss on divestitures 22,793 11,476  
Other 1,612    
Changes in assets and liabilities:      
Accounts receivable 6,801 3,024 6,033
Inventory (3,859) (7,689) (4,348)
Other current assets 7,996 (4,428) (12,334)
Accounts payable (10,253) 12,380 (7,691)
Other current liabilities (4,327) (7,295) (30,171)
Net cash provided by operating activities 118,803 118,434 49,880
Investing Activities:      
Acquisition of business, net of cash acquired (14,823) (15) (66,994)
Proceeds from the sale of property and equipment 219 799 91
Proceeds from divestitures of businesses, net 44,173    
Purchases of property and equipment (23,729) (41,541) (50,785)
Net cash provided by (used in) investing activities 5,840 (40,757) (117,688)
Financing Activities:      
Borrowing of debt 37,812 94,679  
Repayments of debt (96,999) (99,460) (27,156)
Cash paid for financing costs (1,278)    
Cash paid for the cancellation of restricted stock (1,402) (1,188) (1,837)
Proceeds from the exercise of Common Stock options 16,557 14,777 2,755
Cash paid for the repurchase of Common Stock (63,283) (148,074) (5,326)
Net cash used in financing activities (108,593) (139,266) (31,564)
Foreign currency effect (2,722) (1,963) 25,357
Net increase (decrease) in cash, cash equivalents and restricted cash 13,328 (63,552) (74,015)
Cash, cash equivalents and restricted cash at beginning of period 39,620 103,172 177,187
Cash, cash equivalents and restricted cash at end of period 52,948 39,620 103,172
Supplemental disclosure of cash flow information:      
Cash paid for taxes 11,008 23,159 76,741
Cash paid for interest $ 4,462 $ 5,027 $ 4,540