Amended and Restated Senior Credit Agreement (Notes)	6 Months Ended
Amended and Restated Senior Credit Agreement (Notes)	Jun. 30, 2013
Debt Disclosure [Abstract]
Amended and Restated Senior Credit Agreement	Amended and Restated Senior Credit Agreement On January 17, 2013, we entered into an amended and restated $350.0 million senior credit agreement (the "amended and restated senior credit agreement"). The amended and restated senior credit agreement consists of a $350.0 million revolving credit facility expiring on January 17, 2018. The amended and restated senior credit agreement was used to repay borrowings outstanding on the revolving credit facility under the then existing senior credit agreement. In connection with the refinancing, we recorded a $0.3 million loss on the early extinguishment of debt related to the write-off of unamortized deferred financing costs under the previously existing senior credit agreement. Initial interest rates are at LIBOR plus 1.50% (1.70% at June 30, 2013) or an alternative base rate. For those borrowings where the Company elects to use the alternative base rate, the base rate will be the greater of the Prime Rate, the Federal Funds Rate in effect on such date plus 0.50%, or the one month Eurocurrency rate plus 1%, plus an additional margin of 0.50%.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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