Equity - Share-Based Compensation Narrative (Details)	12 Months Ended
	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