Net Income per Share of Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator for earnings per share:
Net income (loss) that is available to common shareholders	$ (93,368)	$ 10,073	$ 66,333
Denominator for basic earnings per share:
Weighted average shares outstanding	22,030,672	21,879,613	21,816,935
Denominator for diluted earnings per share:
Effect of stock options and restricted stock units	0	169,330	342,214
Adjusted weighted average shares and assumed conversions	22,030,672	22,048,943	22,159,149
Basic earnings (loss) per share	$ (4.24)	$ 0.46	$ 3.04
Diluted earnings (loss) per share	$ (4.24)	$ 0.46	$ 2.99
Antidilutive Securities Due to Effect of Period Loss [Member]
Shares excluded from diluted earnings per share due to:
Shares excluded from diluted earnings per share due to:	85,588	0	0
Antidilutive Securities, Excluded From Calculation [Member]
Shares excluded from diluted earnings per share due to:
Shares excluded from diluted earnings per share due to:	846,747	602,402	105,201

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.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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