Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings per Share

Earnings per share is computed as follows (in thousands, except per share data):

	Year Ended December 31,
	2015						2014						2013
	Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount
Basic earnings per share	$	49,133		85,860	$	0.57	$	49,919		87,183	$	0.57	$	51,920		87,537	$	0.59
Effect of dilutive    incentive-based awards				121						297						615
Diluted earnings per share	$	49,133		85,981	$	0.57	$	49,919		87,480	$	0.57	$	51,920		88,152	$	0.59