Common Stock, Dividends, Number of Payment Installments

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- Definition

Number of votes per share.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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- Definition

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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- Definition

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

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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- Definition

Number of new stock issued during the period.

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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

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Shareholders' equity (Narrative) (Details)			12 Months Ended
Shareholders' equity (Narrative) (Details)	Mar. 26, 2019 USD ($) installment $ / shares	Feb. 15, 2019 USD ($) shares	Dec. 31, 2019 USD ($) vote shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares	Dec. 12, 2019 $ / shares	Aug. 14, 2019 $ / shares	Apr. 12, 2019 $ / shares	May 22, 2018 USD ($)	Dec. 31, 2016 shares
Class of Stock [Line Items]
Common stock authorized (in shares)			500,000,000
Common stock issued (in shares)			212,063,631	211,593,073	211,072,508					210,711,224
Common stock outstanding (in shares)										210,711,224
Common stock dividends declared \| $	$ 22,425,000		$ 22,425,000	$ 20,937,000
Class A
Class of Stock [Line Items]
Common stock authorized (in shares)			420,000,000
Common stock issued (in shares)			132,063,631	131,593,073	131,072,508					130,711,224
Common stock outstanding (in shares)										130,711,224
Shares issued during the period (in shares)			470,558	520,565	361,284
Number of votes per share (in votes) \| vote			1
Dividends payable (in dollars per share) \| $ / shares	$ 0.11					$ 0.03	$ 0.03	$ 0.05
Common stock, dividends, number of payment installments \| installment	3
Class B
Class of Stock [Line Items]
Common stock authorized (in shares)			80,000,000
Common stock issued (in shares)			80,000,000	80,000,000	80,000,000					80,000,000
Common stock outstanding (in shares)										80,000,000
Number of votes per share (in votes) \| vote			5
The Repurchase Program
Class of Stock [Line Items]
Number of shares repurchased (in shares)		7,993,602
Value of shares repurchased \| $		$ 60,000,000
The Repurchase Program \| Class A
Class of Stock [Line Items]
Shares authorized, value \| $									$ 60,000,000