Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v3.3.1.900
Fair Value Measurements (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
joint_ventnure
Dec. 31, 2014
USD ($)
Schedule of Trading Security [Line Items]    
Number of joint ventures | joint_ventnure 2  
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Management [Member]    
Schedule of Trading Security [Line Items]    
Maximum percentage of participants' compensation which is deferrable (as a percent) 100.00%  
Balance of the plan which was fully funded | $ $ 5.8 $ 5.9