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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 07, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Nov. 07, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.18 | $ 0.16 | $ 0.16 | $ 0.52 | $ 0.460 |
Estimated total cash dividend |  |  |  | $ 7,567 |  | $ 24,996 | $ 22,657 |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.18 |  |  |  |  |  |
Estimated total cash dividend |  | $ 8,600 |  |  |  |  |  |
Dividends payable, date to be paid |  | Jan. 26, 2017 |  |  |  |  |  |
Dividends payable, date of record |  | Jan. 05, 2017 |  |  |  |  |  |
Number of shares purchased (in shares) |  |  |  |  |  |  |  | 1,244,003
Subsequent Event | Accelerated Share Repurchase Program |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of shares purchased (in shares) | 154,156 |  |  |  |  |  |  | 1,137,656
Stock repurchase program, authorized amount | $ 50,000 |  |  |  |  |  |  | $ 50,000
Stock Repurchased During Period, Value |  |  |  |  |  |  |  | $ 53,500

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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