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Stockholders' Equity - Discussion of Equity and Warrants (Details) - USD ($)		3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 07, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Jun. 21, 2019	Mar. 31, 2019	Sep. 20, 2018	Apr. 26, 2018	Mar. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Total stockholders’ equity		$ 1,995,172,000	$ 1,903,211,000	$ 1,905,676,000	$ 1,995,172,000		$ 1,905,676,000	$ 1,903,211,000		$ 1,946,211,000			$ 1,945,333,000	$ 1,928,255,000
Class of Warrant or Right [Line Items]
Share repurchase program, authorized amount									$ 50,000,000		$ 50,000,000	$ 100,000,000.0
Common stock repurchased and recorded as treasury stock (in shares)			3,436,757		0	5,565,696		9,002,453
Repurchase of treasury stock			$ 50,000,000.0	$ 78,961,000	$ 100,000,000.0		$ 78,961,000
Dividends paid (in dollars per share)		$ 0.14		$ 0.13	$ 0.28		$ 0.26
Convertible Notes
Class of Warrant or Right [Line Items]
Equity component of convertible notes				$ 21,900,000			$ 21,900,000
Issuance costs from convertible notes allocated to equity				461,000			461,000
Repurchase of treasury stock	$ 76,000,000.0					$ 24,000,000.0		$ 150,000,000.0
Additional paid-in capital
Equity [Abstract]
Total stockholders’ equity		$ 1,425,262,000	$ 1,423,405,000	1,421,679,000	$ 1,425,262,000		$ 1,421,679,000	$ 1,423,405,000		$ 1,424,029,000			$ 1,405,806,000	$ 1,405,014,000
Class of Warrant or Right [Line Items]
Equity component of convertible notes after issuance costs				21,400,000
Convertible debt tax adjustment, reduction to additional paid-in capital				$ 6,400,000

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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The amount of subsequent adjustments to additional paid in capital for convertible financial instruments where a component of equity and a component of debt are recognized.

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

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Amount of stock repurchase plan authorized.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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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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