Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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:

	2016	2015	2014
	(in thousands)
Weighted average common shares outstanding (basic)	173,325	175,721	186,219
Impact of common stock equivalents	1,093	1,053	962
Weighted average common shares outstanding (diluted)	174,418	176,774	187,181