Significant Accounting Policies (Details) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted Average Number of Shares Outstanding, Basic	47,343	46,606	45,945	45,225	45,093	44,736	44,651	44,836	46,286	44,830	45,939
Incremental Common Shares Attributable to Stock Options									19	57	115
Incremental Common Shares Attributable to Contingently Issuable Shares									75	40	31
Weighted Average Number of Shares, Restricted Stock									255	585	378
Incremental Common Shares Attributable to Conversion of Debt Securities									857	1,700	194
Incremental Common Shares Attributable to Call Options and Warrants									901	1,029	0
Weighted Average Number of Shares Outstanding, Diluted	47,677	48,030	48,662	49,141	49,195	48,955	47,957	46,820	48,393	48,241	46,657