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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities:    
Net income $ 27,032 $ 14,928
Adjustments to reconcile net income to cash from operating activities:    
Depreciation and amortization 10,547 8,973
Stock-based compensation expense 1,020 1,992
Deferred income taxes 3,516 1,013
Equity in undistributed income of unconsolidated joint ventures (1,009) (613)
Dividends received from unconsolidated joint ventures 616 0
Pension and postretirement benefits (365) (702)
Loss (gain) from the sale of property, plant and equipment (947)  
Bad debt expense 384 0
Proceeds from insurance related to operations 480 0
Changes in operating assets and liabilities, excluding effects of acquisitions:    
Accounts receivable (12,439) (6,657)
Inventories (769) (1,021)
Pension contribution (70) (63)
Other current assets (4,063) (1,621)
Accounts payable and other accrued expenses (1,441) 8,307
Other, net 742 1,651
Net cash provided by operating activities 23,234 26,187
Investing Activities:    
Business acquisition (60,191) 0
Capital expenditures, net (5,270) (4,813)
Proceeds from insurance related to property, plant and equipment 450  
Proceeds from the sale of property, plant and equipment, net 1,603  
Net cash used in investing activities (63,408) (4,813)
Financing Activities:    
Proceeds from long term borrowings   0
Debt issuance costs 1,029 0
Repayment of debt principal and long term lease obligation (87) (757)
Repurchases of capital stock   (1,997)
Proceeds from the exercise of stock options, net 765 564
Issuance of shares upon vesting of restricted stock units, net (2,572) (1,175)
Proceeds from issuance of shares to employee stock purchase plan 422 427
Net cash (used in) provided by financing activities (2,501) (2,938)
Effect of exchange rate fluctuations on cash 1,019 6,181
Net increase (decrease) in cash and cash equivalents (41,656) 24,617
Cash and cash equivalents at beginning of period 227,767 204,586
Cash and cash equivalents at end of period $ 186,111 $ 229,203