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

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Additional aggregate dividends paid during the period for each share of common stock outstanding.

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

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

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended					12 Months Ended
	Feb. 06, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, authorized		300,000,000				300,000,000	300,000,000	300,000,000
Common stock, issued		44,075,840				43,747,805	44,075,840	43,747,805
Common stock, outstanding		38,708,767				38,580,732	38,708,767	38,580,732
Common Stock, Dividends, Per Share, Additional Declared			$ 1.00
Common Stock, Dividends, Per Share, Additional Paid			1.00
Common Stock, Dividends, Per Share, Cash Paid		$ 0.09	0.07	$ 0.07	$ 0.07	$ 0.07
Dividends paid on common stock							$ (50,615)	$ (2,701)	$ 0
Subsequent Event [Line Items]
Dividends declared per common share		$ 0.09	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 1.30	$ 0.07	$ 0.00
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, authorized		50,000,000				50,000,000	50,000,000	50,000,000
Preferred stock, shares Issued		0				0	0	0
Preferred stock, outstanding		0				0	0	0
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date of Record	Mar. 01, 2019
Dividends Payable, Date Declared	Feb. 06, 2019
Dividends Payable, Date to be Paid	Mar. 15, 2019
Dividends declared per common share	$ 0.09