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Equity - Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity activity
Balance at beginning of period	$ 758,648
Net income	20,359	$ 21,513
Stock-based compensation expense	1,376
Stock option exercise	123
Common stock dividends	(22,578)
Other	(1,065)
Balance at end of period	$ 756,863

X

- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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- Definition

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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