Debt (Schedule of Debt Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Long-term Debt, Gross, Fiscal Year Maturity [Abstract]
2013	$ 2,665
2014	10,660
2015	10,660
2016	10,660
2017	10,660
2018	10,660
2019	1,002,040
2020	490,000
Long-term debt	$ 1,548,005	$ 1,542,363