Stockholders' Equity - Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
Feb. 14, 2017	Mar. 31, 2017	Mar. 31, 2016
Components of basic and diluted earnings per share
Net income		$ 33,056	$ 36,968
Weighted average shares outstanding - basic and diluted		84,077,000	82,104,000
Earnings per share:
Earnings per share, basic and diluted (in dollars per share)		$ 0.39	$ 0.45
Dividends
Dividends accrued, per share (in dollars per share)	$ 0.46	$ 0.46
Dividends to be paid		$ 38,500
Common stock repurchases
Shares repurchased in the open market or privately		476,882	1,125,671
Shares repurchased from employees to cover minimum income tax withholdings		1,882	3,671

Aggregate dividends declared during the period for each share of common stock outstanding.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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No definition available.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
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-Topic 505
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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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