Long-Term Debt (Interest Expense Included In Consolidated Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Long-Term Debt [Abstract]
Cash interest expense	$ 1,381	$ 1,345	$ 4,064	$ 3,786
Non-cash amortization of debt discount	2,043	1,910	6,028	5,633
Amortization of debt costs	319	300	940	841
Total interest expense	$ 3,743	$ 3,555	$ 11,032	$ 10,260