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Reinsurance and Catastrophes - Effects of Reinsurance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effects of reinsurance on premiums and benefits |  |  |
Premiums written and contract deposits, Gross Amount | $ 1,244,500 | $ 1,280,903 | $ 1,277,066
Premiums written and contract deposits, Ceded to Other Companies | 21,989 | 22,728 | 24,737
Premiums written and contract deposits, Assumed from Other Companies | 4,606 | 4,324 | 4,184
Premiums written and contract deposits, Net Amount | 1,227,117 | 1,262,499 | 1,256,513
Premiums and contract charges earned, Gross Amount | 812,099 | 777,651 | 752,798
Premiums and contract charges earned, Ceded to Other Companies | 22,036 | 22,826 | 25,077
Premiums and contract charges earned, Assumed from Other Companies | 4,640 | 4,321 | 4,159
Premiums and contract charges earned, Net Amount | 794,703 | 759,146 | 731,880
Benefits, claims and settlement expenses, Gross Amount | 588,621 | 562,385 | 508,904
Benefits, claims and settlement expenses, Ceded to Other Companies | 10,472 | 25,739 | 16,221
Benefits, claims and settlement expenses, Assumed from Other Companies | 4,157 | 4,358 | 3,681
Benefits, claims and settlement expenses, Net Amount | $ 582,306 | $ 541,004 | $ 496,364

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- Definition Insurance premiums and contract charges earned for all insurance contracts assumed from other insurers as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition Insurance premiums written and contract deposits for all insurance contracts assumed from other insurers as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition Insurance premiums and contract charges assumed and earned by another insurer as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition Insurance premiums written and contract deposits assumed by another insurer as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition The sum of insurance premiums earned, premiums earned on the income statement for all insurance contracts before subtracting any amounts ceded to another insurer or adding premiums assumed from other insurers, plus contract charges earned on investment and universal life-type contracts. + References No definition available. + Details
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- Definition The sum of insurance premiums written for all insurance contracts before subtracting any amounts ceded to another insurer or adding premiums assumed from other insurers plus contract deposits on investment and universal life-type contracts. + References No definition available. + Details
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- Definition The sum of insurance premiums earned, premiums earned on the income statement for all insurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, plus contract charges earned on investment and universal life-type contracts. + References No definition available. + Details
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- Definition The sum of insurance premiums written for all insurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, plus contract deposits on investment and universal life-type contracts. + References No definition available. + Details
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- Definition Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of policy benefits and costs incurred for policies assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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