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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Numerator [Abstract] |  |  |  |
Net income | $ 11,541 | $ 11,566 | $ 22,818 | $ 23,168
Basic earnings per share [Abstract] |  |  |  |
Weighted average shares (in shares) | 17,626,000 | 17,530,000 | 17,621,000 | 17,521,000
Diluted earnings per share [Abstract] |  |  |  |
Effect of dilutive stock options and restricted stock grants (in shares) | 19,000 | 12,000 | 20,000 | 17,000
Adjusted weighted average shares (in shares) | 17,645,000 | 17,542,000 | 17,641,000 | 17,538,000
Earnings per share [Abstract] |  |  |  |
Basic earnings per share (in dollars per share) | $ 0.65 | $ 0.66 | $ 1.29 | $ 1.32
Diluted earnings per share (in dollars per share) | $ 0.65 | $ 0.66 | $ 1.29 | $ 1.32
Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Options excluded from diluted calculations (in shares) | 0 | 0 | 0 | 67,953
Weighted average price for anti dilutive securities (in dollars per share) |  | $ 35.31 |  | $ 35.31

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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