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Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 18, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 09, 2015
Debt Instrument [Line Items] |  |  |  |
Notes payable aggregate principal amount |  | $ 310,578 |  |
Other long-term debt maturity year |  | 2053 |  |
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable issuance date |  | Mar. 09, 2015 |  |
Notes payable aggregate principal amount |  | $ 150,000 | $ 150,000 | $ 150,000
Notes payable maturity date |  | Jun. 15, 2045 |  |
Notes payable interest rate |  | 5.95% |  |
Notes payable beginning payment date |  | Jun. 01, 2015 |  |
Notes payable redemption date |  | Jun. 15, 2020 |  |
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing April 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable maturity date |  | Apr. 01, 2017 |  |
Notes payable interest rate |  | 5.875% |  |
Subordinated Notes [Member] | Subordinated Notes Payable Maturing On April 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable aggregate principal amount |  |  | 95,511 |
Term Note [Member] | Term Note Payable, Maturing December 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable aggregate principal amount | $ 125,000 | $ 89,200 | 107,100 |
Notes payable maturity date |  | Dec. 18, 2018 |  |
Notes payable reference for variable rate |  | LIBOR+1.50% |  |
Percentage points added to reference rate | 1.50% |  |  |
Principal payment of term loan |  | $ 4,500 |  |
Other Long-Term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable aggregate principal amount |  | $ 71,378 | $ 89,196 |
Notes payable agreement period |  | 7 years |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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