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Equity Based Plans (Details)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2012
1992 Plan [Member]
Dec. 31, 2011
1992 Plan [Member]
Dec. 31, 2010
1992 Plan [Member]
Dec. 31, 2012
1999 Plan [Member]
Dec. 31, 2011
1999 Plan [Member]
Dec. 31, 2010
1999 Plan [Member]
Dec. 31, 2012
1999 Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
2003 Plan [Member]
Dec. 31, 2011
2003 Plan [Member]
Dec. 31, 2010
2003 Plan [Member]
Dec. 31, 2012
2003 Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
Inducements [Member]
Dec. 31, 2003
Inducements [Member]
Dec. 31, 2011
Inducements [Member]
Dec. 31, 2010
Inducements [Member]
Cumulative summary of equity plans                                            
Authorized 5,509,000             3,495,000     600,000       1,250,000       164,000      
Restricted Stock Issued         614,300 156,750 84,400 0           360,900       253,400   145,000    
Outstanding stock options 75,840 348,810 723,890 874,192       0 0 15,000 15,840 17,310 43,390   60,000 251,500 541,500   0   80,000 124,000
Stock Options Exercised 3,802,263 375,080 142,002         2,796,012     123,951       718,300       164,000      
Exercisable Options 75,840 348,810 723,890             15,000 15,840 17,310 43,390   60,000 251,500 541,500       80,000 124,000
Shares Available for Grant 0 0 0               99,309       218,300