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Bank Borrowings (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Maximum [Member]
LIBOR Loans [Member]
Jun. 30, 2011
Maximum [Member]
Base Rate Loans [Member]
Jun. 30, 2011
Minimum [Member]
LIBOR Loans [Member]
Jun. 30, 2011
Minimum [Member]
Base Rate Loans [Member]
Aug. 15, 2011
LIBOR Loans [Member]
Jun. 30, 2011
LIBOR Loans [Member]
Jun. 30, 2011
Base Rate Loans [Member]
Jun. 30, 2011
Average Borrowing Rates from Credit Agreements [Member]
Jun. 30, 2010
Average Borrowing Rates from Credit Agreements [Member]
Jun. 30, 2011
Average Borrowing Rates from Credit Agreements [Member]
Jun. 30, 2010
Average Borrowing Rates from Credit Agreements [Member]
Revolving credit facility $ 400,000,000 $ 400,000,000                        
Proceeds from new credit agreement   250,613,000                        
Revolving credit facility, with option to increase 500,000,000 500,000,000                        
Maturity date of bank borrowings   May 27, 2016                        
Aggregate bank borrowings 205,200,000 205,200,000 203,000,000                      
Revolving credit facility, available borrowings $ 90,000,000 $ 90,000,000                        
Interest rate description  

At our option, borrowings under the credit agreement bear interest at a variable rate equal to an applicable base rate or LIBOR, in each case plus an applicable margin. For LIBOR loans, the applicable margin will vary depending upon our consolidated leverage ratio (the ratio of total funded debt to adjusted EBITDA, as defined in the credit agreement). As of June 30, 2011, the applicable margins on LIBOR and base rate loans were 1.75% and 0.75%, respectively. Effective August 15, 2011, this margin on the LIBOR loan will drop to 1.50%. Depending upon our performance and financial condition, our LIBOR loans will have applicable margins varying between 1.00% and 2.00% and our base rate loans will have applicable margins varying between zero and 1.00%. Our average borrowing rate (including the impact of our interest rate swap agreements; see Note 10 — Comprehensive Income) was 2.8% for the three and six months ended June 30, 2011, and 6.2% and 6.1%, respectively, for the corresponding periods in 2010.

                       
Maximum consolidated leverage ratio 3.5 3.25                        
Credit agreement, covenant terms  

Our credit agreementcontains certain financial covenants, including covenants that require that we maintain a consolidated leverage ratio of not greater than 3.25:1 (except for the first quarter of each calendar year when the covenant requires us to maintain a consolidated leverage ratio of not greater than 3.5:1) and a consolidated fixed charge coverage ratio (the ratio of the sum of adjusted EBITDA (as defined by the agreement) and rental expense to the sum of cash interest expense and rental expense) of not less than 2.0:1. At June 30, 2011, under the definitions in the credit agreement, our consolidated leverage ratio was 2.3 and our consolidated fixed charge coverage ratio was 3.7. In addition, the credit agreement contains customary affirmative and negative covenants (subject to customary exceptions), including covenants that limit our ability to incur liens or other encumbrances, make investments, incur indebtedness, enter into mergers, consolidations and asset sales, change the nature of our business and engage in transactions with affiliates, as well as customary provisions with respect to events of default.   We were in compliance with the terms of our credit agreements as of June 30, 2011 and 2010; however, there can be no assurances that we will remain in compliance in the future.

                        
Minimum consolidated fixed charge coverage ratio   2.0                        
Consolidated leverage ratio   2.3                        
Consolidated fixed charge coverage ratio   3.7                        
Debt facility, applicable margin.       2.00% 1.00% 1.00% 0.00% 1.50% 1.75% 0.75%        
Credit Agreement, Average Borrowing Rate                     2.80% 6.20% 2.80% 6.10%