Intangible Assets (Narrative) (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
Intangible Assets [Abstract]
Costs incurred to acquire, develop and extend patents			$ 535	$ 305
Amortization expense for intangible assets	3,079	855	9,519	2,806
Annual estimated amortization expense, in 2012	12,545		12,545
Annual estimated amortization expense, in 2013	12,090		12,090
Annual estimated amortization expense, in 2014	11,974		11,974
Annual estimated amortization expense, in 2015	10,765		10,765
Annual estimated amortization expense, in 2016	$ 9,624		$ 9,624