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Earnings Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
Options and stock-based compensation awards are not included in the computation of diluted earnings per share if the impact on earnings per share would be anti-dilutive. We had 11,940 shares of nonvested restricted stock that were excluded from the calculation of diluted earnings per share for the three months ended March 31, 2013. We had no anti-dilutive options or stock-based compensation awards that were excluded from the calculation of diluted earnings per share for the three months ended March 31, 2012.  
The nonvested restricted stock is considered a participating security since the stock contains nonforfeitable rights to dividends. As such, we use the two-class method to compute basic and diluted earnings per share. The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share.
 
 
Three Months Ended
March 31,
(in thousands, except per-share amounts)
 
2013
 
2012
Earnings per share numerator:
 
 
 
 
Net income attributable to common shareholders before allocation of earnings to participating securities
 
$
67,835

 
$
66,547

Earnings allocated to participating securities
 
61

 
0

Net income attributable to common shareholders after allocation of earnings to participating securities
 
$
67,774

 
$
66,547

Earnings per share denominator:
 
 
 
 
Weighted-average number of shares of common stock outstanding - basic and diluted
 
13,376

 
13,405

Earnings per share - basic and diluted
 
$
5.07

 
$
4.96