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Schedule II Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows - operating activities
Interest expense paid	$ (12,532)	$ (11,555)	$ (11,754)
Income taxes paid	(8,679)	(16,259)	(27,847)
Other, net, including settlement of payables to subsidiaries	(16,357)	(6,534)	(16,297)
Net cash provided by operating activities	200,888	256,586	211,433
Cash flows - investing activities
Net Cash Provided by (Used in) Investing Activities	(186,499)	(228,664)	(325,360)
Cash flows - financing activities
Dividends paid to shareholders	(46,689)	(46,114)	(44,310)
Proceeds from exercise of stock options	3,627	4,190	3,329
Withholding tax payments on RSUs tendered	(3,165)	(3,245)	(4,015)
Net cash used in financing activities	(10,110)	(36,965)	115,088
Net increase (decrease) in cash	4,279	(9,043)	1,161
Cash at beginning of period	7,627	16,670	15,509
Cash at end of period	11,906	7,627	16,670
Parent Company [Member]
Cash flows - operating activities
Interest expense paid	(11,892)	(11,503)	(11,754)
Income taxes paid	(216)	(373)	8,914
Cash dividends received from subsidiaries	61,000	56,900	59,600
Other, net, including settlement of payables to subsidiaries	1,214	4,201	581
Net cash provided by operating activities	50,106	49,225	57,341
Cash flows - investing activities
Net increase (decrease) in investments	1,621	(2,338)	9,161
Net Cash Provided by (Used in) Investing Activities	1,621	(2,338)	9,161
Cash flows - financing activities
Dividends paid to shareholders	(46,689)	(46,114)	(44,310)
Acquisition of treasury stock	(5,088)	(1,660)	(21,513)
Proceeds from exercise of stock options	3,627	4,190	3,329
Withholding tax payments on RSUs tendered	(3,165)	(3,245)	(4,015)
Net cash used in financing activities	(51,315)	(46,829)	(66,509)
Net increase (decrease) in cash	412	58	(7)
Cash at beginning of period	126	68	75
Cash at end of period	$ 538	$ 126	$ 68

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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