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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 13,904 $ 18,814
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 7,532 7,048
Pension expense $ 3,277 1,437
Contributions to pension plan   (1,200)
Capital additions - net $ (4,104) (5,586)
Acquisition, net of cash acquired 34 (16,280)
Net cash used in investing activities (4,070) (21,866)
Changes in operating assets and liabilities:    
Accounts receivable - net (6,060) (13,660)
Inventories - net 1,510 3,396
Accounts payable (11) 1,650
Commissions payable (40) 628
Deferred revenue (1,999) (1,736)
Accrued expenses 355 (49)
Benefit obligations and other (954) (4,345)
Net cash provided by operating activities 17,514 11,983
Cash flows from financing activities:    
Cash dividends $ (5,252) (4,726)
Proceeds from bank borrowings   18,000
Payments to bank for borrowings $ (6,000) (4,333)
Net cash (used in) provided by financing activities (11,252) 8,941
Effect of exchange rate changes on cash (694) (735)
Net increase (decrease) in cash and cash equivalents 1,498 (1,677)
Cash and cash equivalents:    
Beginning of period 24,491 31,123
End of period $ 25,989 $ 29,446