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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 07, 2017
Oct. 10, 2017
Dec. 28, 2015
Sep. 18, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basis of Presentation [Line Items]              
Amortization term for acquisition costs of annuity contracts         20 years    
Amortization term for acquisition costs of indexed universal life contracts         30 years    
Amortization of acquisition costs for individual life contracts, first term         10 years    
Amortization of acquisition costs for individual life contracts, second term         15 years    
Amortization of acquisition costs for individual life contracts, third term         20 years    
Amortization of acquisition costs for individual life contracts, fourth term         30 years    
Amortization of acquisition costs for property and casualty contracts, first term         6 months    
Amortization of acquisition costs for property and casualty contracts, second term         12 months    
FHLB borrowings $ 25,000,000 $ 50,000,000     $ 50,000,000 $ 0 $ 0
Weighted average fair value of nonvested options outstanding         $ 6.49    
Unrecognized share-based compensation expense, nonvested options         $ 2,102,000    
Antidilutive securities exclude from EPS computation (in shares)         208,740    
Other comprehensive income (loss), reclassification adjustment from AOCI from sale of securities         $ (4,863,000) 5,176,000 11,667,000
Other tax expense (benefit)         $ (1,702,000) 1,812,000 4,083,000
Minimum exercise price (in usd per share)         $ 38.05    
Maximum exercise price (in usd per share)         $ 41.95    
Excess tax benefit from share-based compensation         $ 3,344,000    
Net cash used in financing activities         36,965,000 (115,088,000) (211,969,000)
Net cash used in operating activities         256,586,000 211,433,000 207,714,000
Non-cancellable operating leases         9,760,000    
Accounting Standards Update 2016-09              
Basis of Presentation [Line Items]              
Net cash used in operating activities         3,245,000 4,015,000 671,000
Accounting Standards Update 2016-09, Statutory Tax Withholding Component              
Basis of Presentation [Line Items]              
Net cash used in financing activities         3,245,000 4,015,000 671,000
Adjustments for New Accounting Pronouncement              
Basis of Presentation [Line Items]              
Net cash provided by (used in) equity securities, short-term and other investments         0 0 2,801,000
Adjustments for New Accounting Pronouncement | Pro Forma              
Basis of Presentation [Line Items]              
Other comprehensive income (loss), unrealized holding gain (loss) on securities arising during period         15,125,000    
Employee Stock Option              
Basis of Presentation [Line Items]              
Share-based compensation expense         1,347,000 1,207,000 1,285,000
Restricted Stock Units              
Basis of Presentation [Line Items]              
Share-based compensation expense         6,459,000 6,929,000 $ 892,000
Unrecognized share-based compensation expense, equity instruments other than options         7,355,000    
Other policyholder funds              
Basis of Presentation [Line Items]              
FHLB Advances         $ 575,000,000    
HMLIC              
Basis of Presentation [Line Items]              
Percentage of reversion to mean approach utilized to amortized policy acquisition costs         10.00%    
FHLB borrowings     $ 75,000,000 $ 250,000,000      
FHLB Interest rate         1.28%    
HMLIC | Maturing On September 13, 2019              
Basis of Presentation [Line Items]              
FHLB Advances         $ 250,000,000    
HMLIC | Maturing On December 15, 2023              
Basis of Presentation [Line Items]              
FHLB Advances         125,000,000    
HMLIC | Maturing On January 16, 2026              
Basis of Presentation [Line Items]              
FHLB Advances         200,000,000    
HMLIC | Investment Contracts              
Basis of Presentation [Line Items]              
FHLB Advances         $ 575,000,000    
Maximum              
Basis of Presentation [Line Items]              
Reserve investment yield assumption life         3.50%    
Minimum              
Basis of Presentation [Line Items]              
Reserve investment yield assumption life         8.00%    
Real Estate Property | Maximum              
Basis of Presentation [Line Items]              
Property, plant and equipment, useful life         45 years    
Real Estate Property | Minimum              
Basis of Presentation [Line Items]              
Property, plant and equipment, useful life         20 years    
Lease hold Improvements And Other Property And Equipment | Maximum              
Basis of Presentation [Line Items]              
Property, plant and equipment, useful life         10 years    
Lease hold Improvements And Other Property And Equipment | Minimum              
Basis of Presentation [Line Items]              
Property, plant and equipment, useful life         2 years    
Interest Sensitive Life Contracts              
Basis of Presentation [Line Items]              
Amortization period of acquisition costs of interest sensitive life contracts         20 years    
Deferred policy acquisition costs, impact of unrealized investment gains (losses)         $ 57,995,000 $ 40,274,000