Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Comparison of basic and diluted earnings per share

The following table sets forth the comparison of basic and diluted earnings per share:

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2015		2014		2015		2014
Basic earnings per share:
Net income	$	9,458	$	151,863	$	133,814	$	328,835
Weighted average common shares outstanding	92,441,730		97,809,639		94,178,989		98,672,618
Basic earnings per share	$	0.10	$	1.55	$	1.42	$	3.33

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2015		2014		2015		2014
Diluted earnings per share:
Net income	$	9,458	$	151,863	$	133,814	$	328,835
Weighted average common shares outstanding	92,441,730		97,809,639		94,178,989		98,672,618
Share equivalents:
Stock options	1,075,735		1,448,071		1,102,252		1,456,439
RSUs and performance-based equity awards	452,938		455,744		534,653		550,224
Employee share purchase plan	13,823		11,348		14,561		12,287
Weighted average common shares and common share equivalents outstanding - diluted	93,984,226		99,724,802		95,830,455		100,691,568
Diluted earnings per share	$	0.10	$	1.52	$	1.40	$	3.27