Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Reconciliation of Weighted Average Common Shares Outstanding

A reconciliation of weighted average common shares outstanding used to calculate basic and diluted net income per share follows:

	2015	2014	2013
	(in thousands)
Weighted average common shares outstanding (basic)	175,721	186,219	193,334
Impact of common stock equivalents	1,053	962	1,020
Weighted average common shares outstanding (diluted)	176,774	187,181	194,354