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Per Share Information - Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts attributable to common stock:
Net income from continuing operations	$ 56,816	$ 124,551	$ 74,365	$ 37,614	$ 113,561	$ 89,313	$ 63,837	$ 48,267	$ 293,346	$ 314,978	$ 198,725
Net loss from discontinued operations									0	0	(342)
Net income attributable to common stock									$ 293,346	$ 314,978	$ 198,383
Weighted average shares:
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares)									152,963	156,124	157,287
Effect of dilutive unvested non-participating stock-based awards (in shares)									1,263	1,031	1
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares)									154,226	157,155	157,288

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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