Long-Term Debt (Interest Expense) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Long-Term Debt [Abstract]
Cash interest expense	$ 1,345	$ 1,044	$ 3,786	$ 3,198
Non-cash amortization of debt discount	1,910	1,785	5,633	5,265
Amortization of debt costs	300	166	841	483
Total interest expense	$ 3,555	$ 2,995	$ 10,260	$ 8,946