Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Schedule of 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.

	Third Quarter Ended September 30,				Nine Months Ended September 30,
(in thousands, except per-share amounts)	2015		2014		2015		2014
Earnings per share numerator:
Net income attributable to common shareholders before allocation of earnings to participating securities	$	62,009	$	56,913	$	184,689	$	181,200
Earnings allocated to participating securities	126		81		395		273
Net income attributable to common shareholders after allocation of earnings to participating securities	$	61,883	$	56,832	$	184,294	$	180,927
Earnings per share denominator:
Weighted-average number of shares of common stock outstanding - basic and diluted	12,187		12,549		12,336		12,745
Earnings per share - basic and diluted	$	5.08	$	4.53	$	14.94	$	14.20