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Stock-Based Compensation Plans (Details 5) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Additional disclosures |  |
Stock-based compensation expense | $ 13,129 | $ 9,843
Capitalized stock-based compensation cost | $ 5,374 | $ 5,490
Performance Shares |  |
Additional disclosures |  |
Grant date value (in dollars per share) | $ 195.72 |
Restricted stock and restricted stock units |  |
Additional disclosures |  |
Unrecognized compensation cost for unvested restricted stock | $ 41,250 |
Weighted average period for recognition of unrecognized compensation cost | 2 years 3 months 18 days |

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