Basis and Summary of Significant Accounting Policies - Statements of Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2020 |
Mar. 31, 2020 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
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| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | $ 1,446,614 | $ 1,737,259 | $ 1,813,508 | $ 1,760,708 | $ 1,737,259 | $ 1,760,708 | $ 1,760,708 |
| Cash Dividends | (2,701) | (2,700) | (2,386) | (2,363) | |||
| Stock-Based Compensation | 6,856 | 5,878 | 6,522 | 7,050 | |||
| Reissued Shares | 1,722 | (5,349) | 3,060 | (10,981) | |||
| Repurchased Shares | (14,414) | ||||||
| Net (Loss) Earnings | 68,377 | (280,005) | 42,650 | 56,078 | (211,628) | 98,728 | |
| Foreign Currency Translation Adjustment | 331 | (1,754) | 618 | 424 | (1,423) | 1,042 | |
| Ending Balance | $ 1,521,199 | 1,446,614 | $ 1,849,558 | $ 1,813,508 | 1,521,199 | 1,849,558 | $ 1,737,259 |
| Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member | us-gaap:AccountingStandardsUpdate201613Member | |||||
| Revision of prior period, accounting standards update, adjustment | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | $ (6,715) | $ 2,592 | $ (6,715) | $ 2,592 | $ 2,592 | ||
| Ending Balance | $ (6,715) | ||||||
| Treasury Stock | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance (in shares) | (23,666) | (24,034) | (23,075) | (23,568) | (24,034) | (23,568) | (23,568) |
| Beginning Balance | $ (620,649) | $ (627,940) | $ (563,583) | $ (567,847) | $ (627,940) | $ (567,847) | $ (567,847) |
| Reissued Shares (in shares) | 53 | 368 | 113 | 493 | |||
| Reissued Shares | $ 1,392 | $ 7,291 | $ 2,776 | $ 4,264 | |||
| Repurchased Shares (in shares) | (243) | ||||||
| Repurchased Shares | $ (14,414) | ||||||
| Ending Balance (in shares) | (23,613) | (23,666) | (23,205) | (23,075) | (23,613) | (23,205) | (24,034) |
| Ending Balance | $ (619,257) | $ (620,649) | $ (575,221) | $ (563,583) | $ (619,257) | $ (575,221) | $ (627,940) |
| Common Stock | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | 45,376 | 45,376 | 45,376 | 45,376 | 45,376 | 45,376 | 45,376 |
| Ending Balance | 45,376 | 45,376 | 45,376 | 45,376 | 45,376 | 45,376 | 45,376 |
| Additional Paid-in Capital | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | 283,467 | 290,229 | 270,727 | 278,922 | 290,229 | 278,922 | 278,922 |
| Stock-Based Compensation | 6,856 | 5,878 | 6,522 | 7,050 | |||
| Reissued Shares | 330 | (12,640) | 284 | (15,245) | |||
| Ending Balance | 290,653 | 283,467 | 277,533 | 270,727 | 290,653 | 277,533 | 290,229 |
| Retained Earnings | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | 1,740,193 | 2,029,613 | 2,061,651 | 2,005,344 | 2,029,613 | 2,005,344 | 2,005,344 |
| Cash Dividends | (2,701) | (2,700) | (2,386) | (2,363) | |||
| Net (Loss) Earnings | 68,377 | (280,005) | 42,650 | 56,078 | |||
| Ending Balance | $ 1,805,869 | $ 1,740,193 | $ 2,101,915 | $ 2,061,651 | 1,805,869 | 2,101,915 | 2,029,613 |
| Dividends, per share (in dollars per share) | $ 0.04 | $ 0.04 | $ 0.035 | $ 0.035 | |||
| Retained Earnings | Revision of prior period, accounting standards update, adjustment | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | $ (6,715) | $ 2,592 | (6,715) | 2,592 | 2,592 | ||
| Ending Balance | (6,715) | ||||||
| Accumulated Other Comprehensive Loss | |||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||
| Beginning Balance | $ (1,773) | (19) | $ (663) | (1,087) | (19) | (1,087) | (1,087) |
| Foreign Currency Translation Adjustment | 331 | (1,754) | 618 | 424 | |||
| Ending Balance | $ (1,442) | $ (1,773) | $ (45) | $ (663) | $ (1,442) | $ (45) | $ (19) |
| X | ||||||||||
- Definition Indicates amendment to accounting standards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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