Number of warrants exercised.

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Common Stock, Conversion Ratio

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Number of warrants or rights outstanding.

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

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Face amount or stated value per share of common stock.

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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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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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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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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Capital Stock (Details)		3 Months Ended		12 Months Ended
Capital Stock (Details)	May 01, 2019 $ / shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 shares	Feb. 24, 2016 USD ($)	Dec. 31, 2012 shares
Class of Stock [Line Items]
Preferred stock authorized for issuance, shares		40,000,000		40,000,000
Preferred stock par value (usd per share) \| $ / shares		$ 0.001		$ 0.001
Treasury stock issued, shares		14,102,185		14,102,185
Dividends declared to shareholders and warrant holders \| $		$ 22,061,000	$ 21,922,000
Regular Cash Dividend
Class of Stock [Line Items]
Dividends declared per common share (usd per share) \| $ / shares		$ 0.25	$ 0.25
Regular Cash Dividend \| Subsequent Event
Class of Stock [Line Items]
Dividends declared per common share (usd per share) \| $ / shares	$ 0.25
Dividend Restriction
Class of Stock [Line Items]
Dividends declared per common share (usd per share) \| $ / shares		$ 0.25
Warrant
Class of Stock [Line Items]
Warrants issued (shares)		30,551					16,789,972
Number of shares called by each warrant (shares)		1
Warrant, exercise price, per share (usd per share) \| $ / shares		$ 0.001
Class A Common Stock
Class of Stock [Line Items]
Common stock, authorized for issuance, shares		1,000,000,000		1,000,000,000
Common stock, par value (usd per share) \| $ / shares		$ 0.001		$ 0.001
Common stock, conversion ratio		1
Number of warrants exercised (shares)		0
Number of shares of common stock issued (shares)		102,349,311	101,713,544	101,790,837	101,429,999
Shares repurchases authorized (amount) \| $						$ 400,000,000
Remaining authorized repurchase amount \| $		$ 168,000,000
Treasury Stock, Value, Acquired, Cost Method \| $		$ 0		$ 0
Class B Common Stock
Class of Stock [Line Items]
Common stock, authorized for issuance, shares		1,000,000,000		1,000,000,000
Common stock, par value (usd per share) \| $ / shares		$ 0.001		$ 0.001
Common stock, conversion ratio		1
Number of shares converted (shares)		0	0
Number of warrants exercised (shares)		0
Number of shares of common stock issued (shares)		5,557	5,557	5,557	5,557
Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized for issuance, shares		40,000,000
Preferred stock par value (usd per share) \| $ / shares		$ 0.001