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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Activities      
Net income $ 40,045 $ 43,209 $ 41,151
Adjustments to reconcile net income to cash provided by operating activities:      
Provision for doubtful accounts 482 965 469
Depreciation 17,696 18,988 10,645
Amortization of intangibles 3,104 3,113 2,005
Amortization of debt issuance 213 214 183
Stock-based compensation expense 1,414 1,057 1,986
Excess tax (benefit) expense from stock-based payment arrangements (230) 142 (94)
Provision for deferred income tax expense (benefit) 2,620 2,804 (108)
Gain on sale of property, plant and equipment (345) (4,046) (911)
Changes in operating assets and liabilities, net of effect of acquisitions:      
Accounts receivable 3,876 (9,657) (12,596)
Inventories 12,340 9,759 (10,993)
Rental equipment 315 (11,699) (5,184)
Prepaid expenses and other (5,634) (3,521) 6,661
Trade accounts payable and accrued liabilities (5,382) (1,708) 1,202
Income taxes payable 2,908 3,700 (3,075)
Other assets and liabilities, net 2,132 (760) (1,131)
Net cash provided by operating activities 75,554 52,560 30,210
Investing Activities      
Acquisitions, net of cash acquired (188) (3,465) (196,467)
Purchase of property, plant and equipment (9,711) (15,479) (9,806)
Proceeds from sale of property, plant and equipment 1,293 4,246 1,442
Purchase of patents (50) 0 0
Net cash used in investing activities (8,656) (14,698) (204,831)
Financing Activities      
Borrowings on bank revolving credit facility 79,000 79,000 273,000
Repayment on bank revolving credit facility (153,000) (125,000) (83,000)
Principal payments on long-term debt and capital leases (38) (449) (682)
Proceeds from issuance of long-term debt 48 0 767
Debt issuance cost (593) 0 (818)
Dividends paid (4,114) (3,628) (3,328)
Proceeds from exercise of stock options 1,369 2,023 903
Treasury stock repurchased 0 0 (34,204)
Common stock repurchased (19) 0 0
Excess tax expense (benefit) from stock-based payment arrangements 230 (142) 94
Net cash (used in) provided by financing activities (77,117) (48,196) 152,732
Effect of exchange rate changes on cash 90 (2,277) (2,538)
Net change in cash and cash equivalents (10,129) (12,611) (24,427)
Cash and cash equivalents at beginning of the year 26,922 39,533 63,960
Cash and cash equivalents at end of the year 16,793 26,922 39,533
Cash paid during the year for:      
Interest 5,796 6,936 3,320
Income taxes $ 16,637 $ 18,709 $ 22,243