Share-base Compensation - Restricted Stock Activity (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at the beginning of year	266,236	526,220	710,731
Granted (in shares)	184,192	0	2,000
Vested (in shares)	(47,120)	(500)	(174,761)
Forfeited / Canceled (in shares)	(30,809)	(259,484)	(11,750)
Unvested shares at the end of year	372,499	266,236	526,220
Time-based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at the beginning of year	100,616	0
Granted (in shares)	55,870	105,616
Vested (in shares)	(26,865)	0
Forfeited / Canceled (in shares)	(1,342)	(5,000)
Unvested shares at the end of year	128,279	100,616