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Debt (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Senior Credit Agreement [Member]
item
Mar. 31, 2013
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Dec. 31, 2013
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Jun. 30, 2013
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Dec. 31, 2012
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Mar. 31, 2013
Senior Subordinated 6.25% Notes [Member]
Dec. 31, 2013
Senior Subordinated 6.25% Notes [Member]
Dec. 31, 2013
Senior Subordinated 6.25% Notes [Member]
Change in Control [Member]
Dec. 31, 2013
Senior Subordinated 6.25% Notes [Member]
On and After February 1, 2019 [Member]
Dec. 31, 2013
Senior Subordinated 6.25% Notes [Member]
Prior to February 1, 2016 [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2013
Minimum [Member]
Senior Credit Agreement [Member]
Dec. 31, 2013
Minimum [Member]
Senior Subordinated 6.25% Notes [Member]
12-Month Redemption Period Beginning February 1, 2018 [Member]
Dec. 31, 2013
Minimum [Member]
Revolving Credit Facility [Member]
Dec. 31, 2013
Maximum [Member]
Senior Credit Agreement [Member]
Dec. 31, 2013
Maximum [Member]
Senior Subordinated 6.25% Notes [Member]
12-Month Redemption Period Beginning February 1, 2017 [Member]
Dec. 31, 2013
Maximum [Member]
Revolving Credit Facility [Member]
Debt Instrument [Line Items]                                          
Standby letters of credit $ 12,788,000                                        
Revolving credit facility, availability amount 102,821,000                                        
Revolving credit facility, borrowings outstanding                           0 0            
Maximum borrowing capacity under the revolving credit facility                               200,000,000     250,000,000    
Revolving credit facility termination date       Oct. 10, 2016                                  
Revolving credit facility, annual commitment fee                           0.375%              
LIBOR floor, plus                                   2.00%     2.50%
Debt instrument, maturity date                   Feb. 01, 2021                      
Repurchase amount             204,000,000                            
Repurchase charge         7,166,000                                
Prepayment premium         3,702,000                                
Write off of deferred financing costs         2,199,000                                
Unamortized original issue discount         1,265,000     1,298,000                          
Payment of deferred financing fees 3,899,000 18,000 1,570,000           3,755,000                        
Senior Subordinated Notes, interest rate           8.00%       6.25%                      
Fixed charge coverage ratio       1.25                                  
Purchase price of the principal amount, percentage                     101.00%                    
Notes issued                   210,000,000                      
Dividend payment restrictions, annual limit per share $ 0.25                                        
Dividend payment restrictions, aggregate annual limit $ 25,000,000                                        
Redemption price percentage                                 101.56%     103.13%  
Redemption price, percentage of principal amount                       100.00% 106.25%                
Redemption percentage of aggregate principal amount                         35.00%