Equity (Capitalization) (Details) (USD $)	Dec. 31, 2013
Class of Stock [Line Items]
Share capital authorized, aggregate nominal amount	$ 20,000,000.0
Common stock, par/nominal value (in dollars per share)	$ 0.01
Par value of preferred stock (in dollars per share)	$ 0.01
Class A Ordinary Shares [Member]
Class of Stock [Line Items]
Common stock, par/nominal value (in dollars per share)	$ 0.01
Number of votes allowed per class of stock (in votes)	10
Number of shares of class A common stock reserved for issuance upon conversion of one class B common share (in shares)	1
Class B Ordinary Shares [Member]
Class of Stock [Line Items]
Common stock, par/nominal value (in dollars per share)	$ 0.01
Number of votes allowed per class of stock (in votes)	1
Common reserved for issuance (in shares)	10,147,184
Class C Ordinary Shares [Member]
Class of Stock [Line Items]
Common stock, par/nominal value (in dollars per share)	$ 0.01
Options [Member] | Class A Ordinary Shares [Member]
Class of Stock [Line Items]
Common reserved for issuance (in shares)	2,708,445
Options [Member] | Class C Ordinary Shares [Member]
Class of Stock [Line Items]
Common reserved for issuance (in shares)	2,161,462
SARs [Member] | Class A Ordinary Shares [Member]
Class of Stock [Line Items]
Common reserved for issuance (in shares)	4,168,758
SARs [Member] | Class C Ordinary Shares [Member]
Class of Stock [Line Items]
Common reserved for issuance (in shares)	4,134,386
Restricted Stock Units (RSUs) including PSUs [Member] | Class A Ordinary Shares [Member]
Class of Stock [Line Items]
Common reserved for issuance (in shares)	1,650,324
Restricted Stock Units (RSUs) including PSUs [Member] | Class C Ordinary Shares [Member]
Class of Stock [Line Items]
Common reserved for issuance (in shares)	1,519,298