Equity - Narrative Related to Share Based Compensation (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Class of Stock [Line Items]
Proceeds from Stock Options Exercised	$ 1,700,000	$ 200,000	$ 1,900,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	800,000	600,000	2,100,000
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	$ 1,000,000	$ (41,000)	$ 1,100,000
Stock Issued During Period, Shares, Other | shares	491	604	842
Stock Issued During Period, Value, Other	$ 14,000	$ 20,000	$ 26,000
Common Class C, Non-Voting [Member]
Class of Stock [Line Items]
Number of Board of Directors	4	5	7