Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Components of basic and diluted earnings per common share

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Net income attributable to common stockholders - Basic	$	9,806	$	17,917	$	26,590	$	25,549
Impact of assumed conversions:
Interest on convertible notes		414		867		—		—
Dividends on preferred stock		—		—		—		140
Net income attributable to common stockholders - Diluted	$	10,220	$	18,784	$	26,590	$	25,689
Weighted average common shares outstanding - Basic		48,384		47,178		48,054		43,201
Assumed conversions:
Incremental common shares from warrants		1,493		1,727		1,617		2,388
Incremental common shares from stock options		1,003		743		986		743
Incremental common shares from convertible preferred stock before conversion		—		—		—		581
Incremental common shares from restricted stock units		158		—		80		—
Incremental common shares from convertible senior notes		2,440		4,681		—		—
Weighted average common shares outstanding - Diluted		53,478		54,329		50,737		46,913
Basic earnings per common share	$	0.20	$	0.38	$	0.55	$	0.59
Diluted earnings per common share	$	0.19	$	0.35	$	0.52	$	0.55