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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Aug. 01, 2017 | Aug. 31, 2016 | Dec. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.21 | $ 0.18 | $ 0.39 | $ 0.34 | $ 0.36 |  |  |  |
Estimated total cash dividend |  |  |  | $ 18,606 | $ 16,438 | $ 17,092 |  |  |  |
Percent of return of cash flows to stockholders |  |  |  | 50.00% |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.21 |  |  |  |  |  |  |  |  |
Estimated total cash dividend | $ 9,900 |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid | Oct. 26, 2017 |  |  |  |  |  |  |  |  |
Dividends payable, date of record | Oct. 05, 2017 |  |  |  |  |  |  |  |  |
Payments to acquire business | $ 9,600 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase Program |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 125,000 | $ 50,000
Accelerated Share Repurchase Program | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 150,000 |  |
Accelerated Share Repurchase Program | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 275,000 |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 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 The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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