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Senior Bank Debt	12 Months Ended
Senior Bank Debt	Dec. 31, 2012
Senior Bank Debt
Senior Bank Debt	10. Senior Bank Debt The Company has a $1,075.0 million senior unsecured credit facility (the "credit facility"), consisting of an $825.0 million revolving credit facility (the "revolver") and a $250.0 million term loan (the "term loan"). The Company pays interest on any outstanding obligations at specified rates (based either on the LIBOR rate or the prime rate as in effect from time to time). A portion of the revolver ($30.0 million) matures in January 2015 with the balance of $795.0 million and the term loan maturing in November 2016. Subject to certain conditions, the Company may increase the revolver and the term loan by up to $75.0 million and $250.0 million, respectively. The credit facility is unsecured and contains financial covenants with respect to leverage and interest coverage, as well as customary affirmative and negative covenants, including limitations on indebtedness, liens, cash dividends, asset dispositions and fundamental corporate changes. As of December 31, 2011 and 2012, the Company had outstanding borrowings of $250.0 million and $325.0 million, respectively. As further described in Note 15, the Company has entered into interest rate swap contracts to exchange a fixed rate for the variable rate on a portion of its credit facility.