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Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Service Life [Member] Equipment [Member]	Dec. 31, 2013 Service Life [Member] Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			20 years	5 years
Income from operations	$ 68,010	$ 58,124	$ 5,500
Net income	$ 31,476	$ 25,433	$ 3,600
Diluted net income per share	$ 0.49	$ 0.38	$ 0.06

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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