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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 2017 |  | 2016 |  | 2015
| (in thousands)
Weighted average common shares outstanding (basic) | 174,721 |  |  | 173,325 |  |  | 175,721 |
Impact of common stock equivalents | 1,211 |  |  | 1,093 |  |  | 1,053 |
Weighted average common shares outstanding (diluted) | 175,932 |  |  | 174,418 |  |  | 176,774 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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