Unaudited Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Unaudited Condensed Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 15,893	$ 53,092	$ 63,347	$ 114,557
Other comprehensive income:
Foreign currency translation adjustments	418	7,874	23,134	(14,759)
Total comprehensive income	16,311	60,966	86,481	99,798
Total comprehensive income attributable to noncontrolling interests	(273)	(500)	(291)	(574)
Total comprehensive income attributable to common stockholders	$ 16,038	$ 60,466	$ 86,190	$ 99,224

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.

+ References

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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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