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Retirement Plans (Retirement Savings Plan) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Retirement Savings Plan [Member]
Dec. 31, 2012
Retirement Savings Plan [Member]
Dec. 31, 2011
Retirement Savings Plan [Member]
Apr. 05, 2013
Non Elective Employer Contribution [Member]
Retirement Savings Plan [Member]
Dec. 31, 2011
Non Elective Employer Contribution [Member]
Retirement Savings Plan [Member]
Apr. 05, 2013
First Tier Of Employee Contributions [Member]
Employer Match [Member]
Retirement Savings Plan [Member]
Dec. 31, 2011
First Tier Of Employee Contributions [Member]
Employer Match [Member]
Retirement Savings Plan [Member]
Apr. 05, 2013
Second Tier Of Employee Contributions [Member]
Employer Match [Member]
Retirement Savings Plan [Member]
Dec. 31, 2011
Second Tier Of Employee Contributions [Member]
Employer Match [Member]
Retirement Savings Plan [Member]
Minimum employee contribution of defined compensation to retirement savings plan percentage 2.00%                  
Maximum employee contribution of defined compensation to retirement savings plan percentage 50.00%                  
Maximum employer match of employee contribution of defined compensation to retirement savings plan percentage         4.00% 4.00% 3.00% 3.00% 3.00% 3.00%
Defined contribution plan, employer matching contribution, percentage             100.00% 100.00% 50.00% 50.00%
Employer contribution   $ 12.2 $ 8.2 $ 7.0