Unaudited Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Unaudited Condensed Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 68,562	$ 15,893	$ 243,311	$ 63,347
Other comprehensive income:
Foreign currency translation adjustments	10,441	418	13,605	23,134
Total comprehensive income	79,003	16,311	256,916	86,481
Total comprehensive income attributable to noncontrolling interests	(88)	(273)	(135)	(291)
Total comprehensive income attributable to common stockholders	$ 78,915	$ 16,038	$ 256,781	$ 86,190

Unaudited Condensed Consolidated Statement of Comprehensive Income [Abstract]

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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