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Debt (Senior Secured Credit Facility) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 28, 2013
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Swingline Loan [Member]
Jun. 30, 2013
Letter Of Credit [Member]
Jun. 28, 2013
Senior Secured Notes [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
Maximum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Maximum [Member]
Senior Secured Notes [Member]
Jun. 24, 2012
Minimum [Member]
Jun. 30, 2013
Minimum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Minimum [Member]
Senior Secured Notes [Member]
Jun. 24, 2012
Debt Covenant Compliance February 2012 [Member]
Jun. 30, 2013
Debt Covenant Compliance July 2012 [Member]
Jun. 24, 2012
Debt Covenant Compliance July 2012 [Member]
Jun. 30, 2013
Debt Covenant Compliance July 2012 [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Debt Covenant Compliance July 2012 [Member]
Maximum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Debt Covenant Compliance July 2012, Base Rate [Member]
Maximum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Debt Covenant Compliance July 2012, LIBOR Rate [Member]
Maximum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Base Rate [Member]
Maximum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Base Rate [Member]
Minimum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
L I B O R [Member]
Maximum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
L I B O R [Member]
Minimum [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Option 1 [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
Option 2 [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
$65 Million Variable Interest Rate Revolving Credit Facility Maturing In 2014 [Member]
Senior Secured Credit Facility [Member]
Jun. 30, 2013
$20 Million 4.00% Fixed Interest Rate Series A Senior Secured Notes Maturing In 2015 [Member]
Senior Secured Notes [Member]
Jun. 30, 2013
$20 Million 4.38% Fixed Interest Rate Series B Senior Secured Notes Maturing In 2016 [Member]
Senior Secured Notes [Member]
Jun. 30, 2013
$20 Million 4.75% Fixed Interest Rate Series C Senior Secured Notes Maturing In 2017 [Member]
Senior Secured Notes [Member]
Debt Instrument [Line Items]                                                            
Leverage ratio               2.75   2.75       2.75                                
Adjusted Leverage Ratio Q1 2012                           3.00                                
Adjusted Leverage Ratio Q2 2012                           3.35   5.25                            
Adjusted Leverage Ratio Q3 2012                           3.25   6.50                            
Adjusted leverage ratio Q4 2012                               5.50                            
Adjusted leverage ratio Q1 2013                               3.50                            
Adjusted leverage ratio Q2 2013                               2.75                            
Original Total Commitment     $ 125.0                                                      
Amended total commitment                                 75.0                          
Original letters of credit sublimit     25.0                                                      
Letters of credit sublimit     5.0                                                      
Original swingline loans sublimit       25.0                                                    
Swingline loans sublimit       5.0                                                    
Cash restructuring excluded from EBITDA calculation                             25.0                              
Fixed charge covenant Q4 2012                               1.00                            
Fixed charge coverage ratio                     1.25   1.25                                  
Cash Balance Threshold for Repayment 65                                                          
Debt Instrument, Basis Spread on Variable Rate                                 0.50%   4.25% 5.25% 2.50% 1.25% 3.50% 2.25% 0.50% 1.00%        
Debt Instrument, Description of Variable Rate Basis                             a daily rate equal to the one-month LIBOR rate, plus 1.00%                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                 0.75%     0.30%           1.00%                        
Repayments of Debt, Maturing in More than Three Months   3.8 6.1     6.2                                                
Line of Credit Facility, Borrowing Capacity, Description 75.0                           68.9                              
Expansion option under credit facility     50.0                                                      
Potential total commitment with expansion option     115.1                                                      
Letters of credit outstanding         1.8                                                  
Percentage of stock pledge of domestic subsidiaries     100.00%       100.00%                                              
Percentage of stock pledge of all first-tier foreign subsidiaries     65.00%       65.00%                                              
Book value of collateral of bank facility     114       114                                              
Face value                                                     $ 65.0 $ 20.0 $ 20.0 $ 20.0
Interest rate                                                       4.00% 4.38% 4.75%
Maturity date                                                       2015 2016 2017