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Stock Options, Restricted Stock and Restricted Stock Units - Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of stock option activity and other stock option information
Exercisable, Number of shares	100,000	100,000	100,000
Exercisable, Weighted-average exercise price	$ 51.95	$ 51.95	$ 51.95
Stock options [Member]
Schedule of stock option activity and other stock option information
Beginning Balance, Number of shares	100,000	100,000	100,000
Grants, Number of shares
Exercises, Number of shares
Forfeitures/Expirations, Number of shares
Ending Balance, Number of shares	100,000	100,000	100,000	100,000
Exercisable, Number of shares	100,000
Beginning Balance, Weighted-average exercise price	$ 51.95	$ 51.95	$ 51.95
Grants, Weighted-average exercise price
Exercises, Weighted-average exercise price
Forfeitures/Expirations, Weighted-average exercise price
Ending Balance, Weighted-average exercise price	51.95	$ 51.95	$ 51.95	$ 51.95
Exercisable, Weighted-average exercise price	$ 51.95
Weighted-average remaining contractual life (years)	3 years 1 month 6 days	4 years 1 month 6 days	5 years 1 month 6 days	6 years
Exercisable, Weighted-average remaining contractual life (years)	3 years 1 month 6 days
Beginning Balance, Aggregate intrinsic value	$ 2,868	$ 817	$ 2,233
Ending Balance, Aggregate intrinsic value	3,763	$ 2,868	$ 817	$ 2,233
Exercisable, Aggregate intrinsic value	$ 3,763

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iii)
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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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-Publisher FASB
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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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