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Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Noncontrolling Interests
Revenues	$ 555,945	$ 613,237	$ 1,432,270	$ 1,598,602
Net income attributable to noncontrolling interests	72		126	432
Tax effect on income recognized	11,764	$ 15,105	15,159	32,813
Blythe | Primary beneficiary
Noncontrolling Interests
Revenues	11		119	940
Net income attributable to noncontrolling interests	5		59	432
Tax effect on income recognized			0
Distributions to non-controlling interests			29	1,515
Distributions from joint venture			29	$ 1,515
Capital contributions			0		$ 0
Carlsbad | Primary beneficiary
Noncontrolling Interests
Revenues	1,020		1,020
Net income attributable to noncontrolling interests	$ 67		67
Tax effect on income recognized			0
Distributions to partners			0
Capital contributions			$ 0

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