Stockholders' Equity (Share-Based Payments - General Descriptions) (Details) - USD ($)
$ / shares in Units, $ in Thousands |
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12 Months Ended |
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Apr. 14, 2016 |
Feb. 17, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Oct. 01, 2015 |
Jun. 20, 2008 |
Jun. 25, 2004 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Capital and surplus |
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$ 1,251,361
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$ 1,171,203
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$ 1,185,643
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| Expiration period of awards (in years) |
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10 years
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| Period in force (in days) |
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90 days
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| Share Price (in usd per share) |
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$ 310.80
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| Award vesting period (in years) |
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3 years
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| Performance period for grants (in years) |
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3 years
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| Compensation cost, liability balance |
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$ 12,000
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6,200
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| Pre-tax compensation cost (benefit) recognized |
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7,900
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(900)
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4,400
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| Compensation cost (benefit), tax expense (benefit) |
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2,800
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300
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1,500
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| Period of recognition |
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$ 2,300
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$ 1,400
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2,300
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| Compensation cost related to nonvested options not yet recognized, weighted-average period of recognition (in years) |
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1 year 7 months 6 days
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| Common Class A |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock, par value (usd per share) |
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$ 0.01
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$ 0.01
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$ 1.00
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$ 0.01
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| Share Price (in usd per share) |
$ 226.84
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$ 216.48
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| Common Class B |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock, par value (usd per share) |
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$ 0.01
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$ 0.01
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| Stock and Incentive Plan, 1995 Plan [Member] | Common Class A |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based payments, number of shares authorized under plans |
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13,268
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| Stock and Incentive Plan, 2008 Plan | Common Class A |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based payments, number of shares authorized under plans |
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300,000
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| Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Annual vesting (in percentage) |
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20.00%
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| Requisite service period of awards (in years) |
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1 year
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| Employees |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Annual vesting (in percentage) |
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20.00%
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| Requisite service period of awards (in years) |
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3 years
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| Colorado Division of Insurance |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Current authorized control level RBC |
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$ 106,800
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| Capital and surplus |
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$ 1,300,000
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| Newco Merger | Common Class A |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock, par value (usd per share) |
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0.01
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| Newco Merger | Common Class B |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock, par value (usd per share) |
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$ 0.01
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| SAR |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Annual vesting (in percentage) |
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33.30%
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| Granted (in shares) |
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14,643
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14,643
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| Intrinsic value of options exercised |
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$ 3,600
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$ 700
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1,100
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| Share-based compensation liabilities paid |
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$ 3,600
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$ 700
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$ 1,100
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| PSU |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted (in shares) |
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5,727
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5,727
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| RSU |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted (in shares) |
2,563
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3,661
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6,224
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