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Stock Based Compensation (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 USD ($) item shares | Jun. 30, 2015 USD ($) shares
Stock-based compensation |  |
Number of stock-based employee compensation plans | item | 4 |
Number of executive stock award plans | item | 3 |
Outstanding stock options (in shares) | 0 | 0
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $ | $ 5,390 |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 3 years 3 months 23 days |
Stock options |  |
Stock-based compensation |  |
Total fair value of options vested and expensed | $ | $ 0 | $ 0
Outstanding stock options (in shares) | 0 | 0
Stock options exercised (in shares) | 0 | 0

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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