Long-Term Debt (Interest Expense Included In Consolidated Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Long-Term Debt [Abstract]
Cash interest expense	$ 1,334	$ 1,152
Non-cash amortization of debt discount	1,975	1,846
Amortization of debt costs	308	246
Total interest expense	$ 3,617	$ 3,244