XML 109 R92.htm IDEA: XBRL DOCUMENT v2.4.0.6
Employee Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Contribution Plan [Line Items]      
Percentage of contributions by participants 75.00%    
Percentage of matching cash contributions 50.00%    
Percentage of maximum contributions 5.00%    
Company's vested contribution description on one year of service 20.00%    
Company's vested contribution description after five years of service 100.00%    
401(K) Savings Plan And Nonqualified Savings Plan [Member]
     
Defined Contribution Plan [Line Items]      
Company's total contributions $ 4.7 $ 3.6 $ 2.8
Supplemental Executive Retirement Plan [Member]
     
Defined Contribution Plan [Line Items]      
Compensation expenses $ 1.0 $ 0.9 $ 0.8