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Saving and Retirement Plans - 401(K) Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current Fiscal Year End Date | --12-31 |  |
Profit Sharing Contribution, Vesting Period | 3 years |  |
Defined Contribution Plan, Cost Recognized | $ 3,300,000 | $ 3,100,000 | $ 2,800,000
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount | $ 5,000 |  |

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