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Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jan. 01, 2014 Service Life [Member] Equipment [Member]	Sep. 30, 2014 Service Life [Member] Equipment [Member]	Sep. 30, 2014 Service Life [Member] Equipment [Member]	Sep. 30, 2014 Maximum [Member] Service Life [Member] Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Increase in Estimated Useful Life					5 years
Property, Plant and Equipment, Useful Life								20 years
Income from operations	$ 147,635	$ 135,859	$ 301,725	$ 268,888		$ 5,400	$ 16,800
Net income	$ 83,276	$ 77,175	$ 158,755	$ 162,137		$ 3,500	$ 11,000
Diluted net income per share (usd per share)	$ 1.31	$ 1.21	$ 2.49	$ 2.50		$ 0.06	$ 0.17

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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