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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Common Stock Activity [Roll Forward] |  |
Beginning balance | $ 211,806 |
Ending balance | 213,099 |
Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Beginning balance | 211,806 | $ 194,953
Stock compensation expense | 2,745 | 5,606
Ending balance | 213,099 | 200,002
Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Beginning balance | 296,390 | 296,081
Stock compensation expense | 0 | 0
Ending balance | 300,919 | 297,350
Restricted and performance stock awards | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Restricted and performance stock awards | 2,411 | 1,102
Restricted and performance stock awards | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Restricted and performance stock awards | 2,411 | 1,102
Stock options exercised | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Stock compensation expense | 959 | 545
Stock options exercised | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Stock compensation expense | 506 | 302
Stock Compensation Plan | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Treasury shares purchased | 0 | 0
Stock Compensation Plan | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Treasury shares purchased | $ (7,446) | $ (2,673)

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- Definition Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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