Debt	3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]
Debt	Debt During the three months ended March 31, 2014, we made principal payments of $66.0 million, primarily on our five-year term loan, due October 2018. For the three months ended March 31, 2014 and 2013, cash payments for interest were $10.5 million and $5.9 million, respectively. Included in interest expense, net, are amortization of financing costs and amortization of treasury lock settlements. For both the three months ended March 31, 2014 and 2013, amortization of treasury lock settlements was $1.4 million. Amortization of financing costs for the three months ended March 31, 2014 and 2013, was $0.5 million and $0.2 million, respectively. We have outstanding $1.25 billion of fixed rate senior notes and $1.23 billion of variable rate term loans. At March 31, 2014, the book value of our fixed-rate debt was $1.25 billion, and the fair value was estimated to be $1.29 billion. The difference between the book value and fair value is due to the difference between the period-end market interest rate and the stated rate of our fixed-rate debt. We estimated the fair value of our fixed-rate debt using quoted market prices (Level 2 inputs) within the fair value hierarchy, which is further defined in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2013 Form 10-K.

Debt

3 Months Ended

Mar. 31, 2014

During the three months ended March 31, 2014, we made principal payments of $66.0 million, primarily on our five-year term loan, due October 2018. For the three months ended March 31, 2014 and 2013, cash payments for interest were $10.5 million and $5.9 million, respectively.

Included in interest expense, net, are amortization of financing costs and amortization of treasury lock settlements. For both the three months ended March 31, 2014 and 2013, amortization of treasury lock settlements was $1.4 million. Amortization of financing costs for the three months ended March 31, 2014 and 2013, was $0.5 million and $0.2 million, respectively.

We have outstanding $1.25 billion of fixed rate senior notes and $1.23 billion of variable rate term loans. At March 31, 2014, the book value of our fixed-rate debt was $1.25 billion, and the fair value was estimated to be $1.29 billion. The difference between the book value and fair value is due to the difference between the period-end market interest rate and the stated rate of our fixed-rate debt. We estimated the fair value of our fixed-rate debt using quoted market prices (Level 2 inputs) within the fair value hierarchy, which is further defined in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2013 Form 10-K.