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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows - operating activities |  |  |
Interest expense paid | $ (11,555) | $ (11,754) | $ (13,521)
Income taxes paid | (16,259) | (27,847) | (24,861)
Other, net, including settlement of payables to subsidiaries | (6,534) | (16,297) | (5,430)
Net cash provided by operating activities | 256,586 | 211,433 | 207,714
Cash flows - investing activities |  |  |
Net Cash Provided by (Used in) Investing Activities | (228,664) | (325,360) | (415,849)
Cash flows - financing activities |  |  |
Dividends paid to shareholders | (46,114) | (44,310) | (42,523)
Proceeds from issuance of Senior Notes due 2025 | 0 | 0 | 246,937
Redemption of Senior Notes due 2016 | 0 | 0 | (127,292)
Maturity of Senior Notes due 2015 | 0 | 0 | (75,000)
Principal repayment on Bank Credit Facility | 0 | 0 | (38,000)
Proceeds from exercise of stock options | 4,190 | 3,329 | 1,629
Withholding tax payments on RSUs tendered | (3,245) | (4,015) | (671)
Net cash used in financing activities | (36,965) | 115,088 | 211,969
Net increase (decrease) in cash | (9,043) | 1,161 | 3,834
Cash at beginning of period | 16,670 | 15,509 | 11,675
Cash at end of period | 7,627 | 16,670 | 15,509
Parent Company [Member] |  |  |
Cash flows - operating activities |  |  |
Interest expense paid | (11,503) | (11,754) | (13,521)
Income taxes paid | (373) | 8,914 | 8,413
Cash dividends received from subsidiaries | 56,900 | 59,600 | 50,000
Other, net, including settlement of payables to subsidiaries | 4,201 | 581 | (3,426)
Net cash provided by operating activities | 49,225 | 57,341 | 41,466
Cash flows - investing activities |  |  |
Net increase (decrease) in investments | (2,338) | 9,161 | 15,402
Net Cash Provided by (Used in) Investing Activities | (2,338) | 9,161 | 15,402
Cash flows - financing activities |  |  |
Dividends paid to shareholders | (46,114) | (44,310) | (42,523)
Proceeds from issuance of Senior Notes due 2025 | 0 | 0 | 246,937
Redemption of Senior Notes due 2016 | 0 | 0 | (127,292)
Maturity of Senior Notes due 2015 | 0 | 0 | (75,000)
Principal repayment on Bank Credit Facility | 0 | 0 | (38,000)
Acquisition of treasury stock | (1,660) | (21,513) | (21,950)
Proceeds from exercise of stock options | 4,190 | 3,329 | 1,629
Withholding tax payments on RSUs tendered | (3,245) | (4,015) | (671)
Net cash used in financing activities | (46,829) | (66,509) | (56,870)
Net increase (decrease) in cash | 58 | (7) | (2)
Cash at beginning of period | 68 | 75 | 77
Cash at end of period | $ 126 | $ 68 | $ 75

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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://www.xbrl.org/2003/role/presentationRef -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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + 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://www.xbrl.org/2003/role/presentationRef -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. Includes, but is not limited to, 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The cash outflow for the settlement of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, as it matures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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