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Schedule II - Condensed Financial Information of Registrant (Condensed Statements of Cash Flow) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided (used) by operating activities | $ 111,960 | $ 96,002 | $ 38,602
Purchases of: |  |  |
Equity securities trading | (271,608) | (119,865) | (87,604)
Proceeds from sale or maturities of: |  |  |
Fixed maturities, available for sale | 886,886 | 703,828 | 970,708
Equity securities trading | 236,476 | 134,005 | 123,645
Net decrease (increase) in short-term investments | 11,932 | 140,411 | (176,092)
(Increase) decrease in restricted cash | 0 | 78,000 | (78,000)
Funds at Lloyd's in support of Syndicate 1729, returned (deposited) | 0 | 8,690 | (8,699)
Other | (2,505) | (1,507) | (4,062)
Net cash provided (used) by investing activities | 227,787 | 266,980 | (67,803)
Financing Activities |  |  |
Principal repayment of debt | 0 | 0 | (127,183)
Repurchase of common stock | (172,772) | (222,360) | (29,089)
Excess of tax benefit from share-based payment arrangements | 494 | 2,702 | 2,128
Dividends to shareholders | (217,626) | (71,252) | (46,375)
Other | (5,783) | (4,415) | (9,448)
Net cash provided (used) by financing activities | (295,687) | (295,325) | 40,033
Increase (decrease) in cash and cash equivalents | 44,060 | 67,657 | 10,832
Cash and cash equivalents at beginning of period | 197,040 | 129,383 | 118,551
Cash and cash equivalents at end of period | 241,100 | 197,040 | 129,383
Supplemental Disclosure of Cash Flow Information |  |  |
Cash paid during the year for income taxes, net of refunds | 42,784 | 22,968 | 117,107
Cash paid during the year for interest | 13,996 | 13,408 | 913
Significant non-cash transactions: |  |  |
Dividends declared and not yet paid | 69,447 | 167,744 | 18,532
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided (used) by operating activities | (14,411) | 20,086 | (24,654)
Purchases of: |  |  |
Equity securities trading | 0 | (310) | (1,265)
Proceeds from sale or maturities of: |  |  |
Fixed maturities, available for sale | 200,245 | 104,844 | 224,993
Equity securities trading | 0 | 12,813 | 1,113
Net decrease (increase) in short-term investments | 26,074 | 149,202 | (187,625)
Dividends from subsidiaries | 107,870 | 67,188 | 239,484
Contribution of capital to subsidiaries | 0 | (7,000) | 0
Cash paid for acquisitions, net of cash received | 0 | 0 | (205,244)
(Increase) decrease in restricted cash | 0 | 78,000 | (78,000)
Funds at Lloyd's in support of Syndicate 1729, returned (deposited) | (9,642) | (76,553) | (8,699)
Funds advanced under Syndicate 1729 credit agreement | (3,083) | (9,107) | (1,665)
Other | (289) | 415 | (20)
Net cash provided (used) by investing activities | 321,175 | 319,492 | (16,928)
Financing Activities |  |  |
Borrowing under revolving credit agreement | 100,000 | 0 | 250,000
Principal repayment of debt | 0 | 0 | (125,000)
Repurchase of common stock | (172,772) | (222,360) | (29,089)
Subsidiary payments for common shares and share-based compensation awarded to subsidiary employees | 6,063 | 8,301 | 6,258
Excess of tax benefit from share-based payment arrangements | 379 | 1,631 | 2,128
Dividends to shareholders | (217,626) | (70,490) | (46,375)
Other | (6,716) | (6,919) | (8,278)
Net cash provided (used) by financing activities | (290,672) | (289,837) | 49,644
Increase (decrease) in cash and cash equivalents | 16,092 | 49,741 | 8,062
Cash and cash equivalents at beginning of period | 87,200 | 37,459 | 29,397
Cash and cash equivalents at end of period | 103,292 | 87,200 | 37,459
Supplemental Disclosure of Cash Flow Information |  |  |
Cash paid during the year for income taxes, net of refunds | 47,004 | 26,764 | 120,031
Cash paid during the year for interest | 13,996 | 13,408 | 913
Significant non-cash transactions: |  |  |
Dividends declared and not yet paid | 69,447 | 167,744 | 18,532
Securities transferred at fair value as dividends from subsidiaries | 206,880 | 227,412 | 69,011
Non-cash capital contribution to subsidiaries | $ 87,719 | $ 0 | $ 0

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- Definition The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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- References No definition available. + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + 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=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- References No definition available. + Details
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