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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of increase (decrease) in cash. Cash is the 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. Includes effect from exchange rate changes. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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