Common Stock, Dividends, Number of Payment Installments

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- Definition

Defined Benefit Plan, Period, Salary Paid

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- Definition

Number of votes per share.

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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

Face amount per share of no-par value common stock.

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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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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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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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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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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) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 20, 2018 USD ($) installment $ / shares	Dec. 31, 2018 USD ($) vote $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares	Oct. 05, 2018 $ / shares	May 22, 2018 USD ($) $ / shares	Apr. 05, 2018 $ / shares	Dec. 31, 2015 $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized		500,000,000
Common stock, shares issued		211,593,073	211,072,508	210,711,224				210,538,896
Common stock, shares outstanding								210,538,896
Common stock dividends declared \| $	$ 20,937	$ 20,937	$ 0	$ 0
Salary period paid upon employee leaving		30 days
Class A
Class of Stock [Line Items]
Common stock, shares authorized		420,000,000
Common stock, par value (in dollars per share) \| $ / shares		$ 0						$ 0
Common stock, shares issued		131,593,073	131,072,508	130,711,224				130,538,896
Common stock, shares outstanding								130,538,896
Shares issued during the period		520,565	361,284	172,328
Number of votes per share (in votes) \| vote		1
Common stock, dividends, number of payment installments \| installment	2
Dividends payable (in dollars per share) \| $ / shares	$ 0.10				$ 0.05		$ 0.05
Class B
Class of Stock [Line Items]
Common stock, shares authorized		80,000,000
Common stock, par value (in dollars per share) \| $ / shares		$ 0	$ 0
Common stock, shares issued		80,000,000	80,000,000	80,000,000				80,000,000
Common stock, shares outstanding								80,000,000
Number of votes per share (in votes) \| vote		5
Common stock, dividends, number of payment installments \| installment	2
Dividends payable (in dollars per share) \| $ / shares	$ 0.10				$ 0.05		$ 0.05
The Repurchase Program
Class of Stock [Line Items]
Number of shares repurchased (in shares)		6,360,826
Value of shares repurchased \| $		$ 46,035
The Repurchase Program \| Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share) \| $ / shares						$ 0
Shares authorized \| $						$ 60,000