Long-Term Debt (Interest Expense Included In Consolidated Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Long-Term Debt [Abstract]
Cash interest expense	$ 1,350	$ 1,288	$ 2,683	$ 2,440
Non-cash amortization of debt discount	2,009	1,878	3,985	3,724
Amortization of debt costs	313	295	621	541
Total interest expense	$ 3,672	$ 3,461	$ 7,289	$ 6,705