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Equity - Share-Based Compensation Narrative (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares
Class of Stock [Line Items] |  |  |
Proceeds from Stock Options Exercised | $ 500,000 | $ 1,700,000 | $ 200,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | 3,600,000 | 800,000 | 600,000
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options | $ (3,100,000) | $ (600,000) | $ (300,000)
Stock Issued During Period, Shares, Other | shares | 1,130 | 491 | 604
Stock Issued During Period, Value, Other | $ 41,000 | $ 14,000 | $ 20,000
Common Class C, Non-Voting [Member] |  |  |
Class of Stock [Line Items] |  |  |
Number of Board of Directors | 4 | 4 | 5

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