Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 61,444	$ 48,490
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	17,323	16,762
Depreciation and amortization	18,820	20,322
Changes to value of life insurance policies	(4,541)	(505)
Deferred income taxes	3,914	(3,910)
Other non-cash items	(696)	(1,226)
Changes in assets and liabilities:
Accounts receivable	(15,488)	37,610
Inventories	(796)	2,995
Prepaid expenses and other current assets	(1,545)	4,029
Other assets	1,960	(128)
Accounts payable	2,307	(3,023)
Accrued expenses	(10,676)	(13,017)
Increase (Decrease) in Deferred Revenue	(1,393)	(1,111)
Other long-term liabilities	7,722	1,396
Net cash provided by operating activities	78,355	108,684
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(14,264)	(7,740)
Patents and other intangibles	(282)	(205)
Business acquisition, net of cash acquired	0	(1,242)
Proceeds from sale of assets	643	705
Premiums on life insurance	(1,351)	(2,015)
Net cash used in investing activities	(15,254)	(10,497)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(89,000)	(290,226)
Proceeds from debt borrowings	106,000	63,000
Excess tax benefits from stock-based compensation	0	(187)
Non-controlling interest - dividend	(27)	(211)
Payments of Dividends	(72,861)	(70,883)
Repurchase of common shares	(8,197)	(2,157)
Stock Issued During Period, Value, New Issues	0	197,202
Net cash used in financing activities	(64,085)	(103,462)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(984)	(5,275)
CASH AND CASH EQUIVALENTS, beginning of period	14,764	22,494
CASH AND CASH EQUIVALENTS, end of period	$ 13,780	$ 17,219