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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Long-Term Debt [Abstract]
Cash interest expense	$ 990	$ 1,381	$ 3,420	$ 4,064
Non-cash amortization of debt discount	2,186	2,043	6,450	6,028
Amortization and write-off of debt costs	324	319	1,421	940
Total interest expense	$ 3,500	$ 3,743	$ 11,291	$ 11,032