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Long Term Retention Plan (Long Term Retention Plans Accrued Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	$ 10,914	$ 6,666	$ 27,706	$ 28,734
LTRP 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan				29
LTRP 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan		147	24	891
LTRP 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	318	229	806	1,422
LTRP 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	526	315	1,325	1,945
LTRP 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	846	711	2,268	3,809
LTRP 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	1,056	772	2,768	3,782
LTRP 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	1,474	1,063	3,790	4,680
LTRP 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	2,131	1,606	5,547	6,717
LTRP 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	2,074	$ 1,823	5,587	$ 5,459
LTRP 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term retention plan	$ 2,489		$ 5,591

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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 (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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+ References

No definition available.

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