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Accounting Policies - Earnings Per Share Anti-Dilutive (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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic | $ 17,488 |  | $ 12,006 |  | $ 36,103 |  | $ 22,323 |
Net Income (Loss) Available to Common Stockholders, Diluted | $ 17,488 |  | $ 12,006 |  | $ 36,103 |  | $ 22,323 |
Stock options, SARs and restricted stock | 183,000 | [1] | 158,000 | [2] | 207,000 | [2] | 348,000 | [2]
Weighted Average Number of Shares Outstanding, Basic | 10,600,000 |  | 10,456,000 |  | 10,576,000 |  | 10,460,000 |
Basic earnings per common share | $ 1.65 | [3] | $ 1.15 |  | $ 3.41 | [4] | $ 2.13 |
Earnings Per Share, On Incremental Common Shares Attributable to Share-based Payment Arrangements | $ (0.03) | [1] | $ (0.02) | [2] | $ (0.06) | [2] | $ (0.06) | [2]
Weighted Average Number of Shares Outstanding, Diluted | 10,783,000 |  | 10,614,000 |  | 10,783,000 |  | 10,808,000 |
Diluted earnings per common share | $ 1.62000 | [3] | $ 1.13000 |  | $ 3.35000 | [4] | $ 2.07000 |
Stock Options and SARs [Members] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from earnings per share (shares) | 24,907 |  | 229,693 |  | 37,832 |  | 215,547 |
Performance Shares [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from earnings per share (shares) | 32,892 |  | 37,284 |  | 32,892 |  | 37,284 |
[1] | For the three months ended June 30, 2017 and 2016, stock options and SARs of 24,907 and 229,693, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because they were anti-dilutive. For the three months ended June 30, 2017 and 2016, contingent shares of non-vested restricted stock of 32,892, and 37,284, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because performance conditions had not yet been met.
[2] | For the six months ended June 30, 2017 and 2016, stock options and SARs of 37,832 and 215,547, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because they were anti-dilutive. For the six months ended June 30, 2017 and 2016, contingent shares of non-vested restricted stock of 32,892, and 37,284, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because performance conditions had not yet been met.
[3] | For the effect of the adoption of the new Accounting Standard Update 2016-09, "Improvements to Employee Share-Based Payment Accounting," on Basic and Diluted EPS, see Note 1(d) "New Accounting Standards."
[4] | For the effect of the adoption of the new Accounting Standard Update 2016-09, "Improvements to Employee Share-Based Payment Accounting," on Basic and Diluted EPS, see Note 1(d) "New Accounting Standards."

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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