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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jan. 09, 2014
Stockholders' Equity [Line Items] |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  | $ 45.75
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, shares |  |  | 36,244,071 |  | 2,530,000
Balance |  |  | $ 841,392 | $ 694,210 |
Net earnings as reported | 32,577 | 38,191 | 93,033 | 78,375 |
Exercise/vesting of equity awards, value |  |  | 734 | 11,225 |
Excess income tax benefit from stock-based awards |  |  | 2,197 | 1,733 |
Equity award compensation expense |  |  | 9,035 | 7,040 |
Issuance of stock, value |  |  | 110,420 |  |
Other |  |  | (114) |  |
Non-controlling interest acquisition |  |  |  | (257) |
Balance, shares | 39,125,006 |  | 39,125,006 |  | 2,530,000
Balance | 1,056,697 | 792,326 | 1,056,697 | 792,326 |
Common Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, shares |  |  | 36,244,000 | 35,613,000 |
Balance |  |  | 362 | 356 |
Net earnings as reported |  |  | 0 | 0 |
Exercise/vesting of equity awards, shares |  |  | 351,000 | 618,000 |
Exercise/vesting of equity awards, value |  |  | 4 | 6 |
Equity award compensation expense |  |  | 0 | 0 |
Issuance of stock, shares |  |  | 2,530,000 |  |
Issuance of stock, value |  |  | 25 |  |
Other |  |  | 0 |  |
Non-controlling interest acquisition |  |  |  | 0 |
Balance, shares | 39,125,000 | 36,231,000 | 39,125,000 | 36,231,000 |
Balance | 391 | 362 | 391 | 362 |
Additional Paid In Capital [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance |  |  | 412,961 | 390,249 |
Net earnings as reported |  |  | 0 | 0 |
Exercise/vesting of equity awards, value |  |  | 730 | 11,219 |
Excess income tax benefit from stock-based awards |  |  | 2,197 | 1,733 |
Equity award compensation expense |  |  | 9,035 | 7,040 |
Issuance of stock, value |  |  | 110,395 |  |
Other |  |  | (114) |  |
Non-controlling interest acquisition |  |  |  | (257) |
Balance | 535,204 | 409,984 | 535,204 | 409,984 |
Retained Earnings [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance |  |  | 428,069 | 303,605 |
Net earnings as reported |  |  | 93,033 | 78,375 |
Exercise/vesting of equity awards, value |  |  | 0 | 0 |
Equity award compensation expense |  |  | 0 | 0 |
Issuance of stock, value |  |  | 0 |  |
Other |  |  | 0 |  |
Non-controlling interest acquisition |  |  |  | 0 |
Balance | $ 521,102 | $ 381,980 | $ 521,102 | $ 381,980 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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