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Stock Option Summary (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
[Line Items] |  |  |  |
Outstanding, beginning balance (in shares) | 895 | 956 | 956 |
Outstanding, beginning balance, weighted average exercise price per share (in dollars per share) | $ 47.93 | $ 47.10 | $ 47.10 |
Outstanding, weighted average remaining contractual life | 5 years 9 months 18 days | 6 years 8 months 12 days | 6 years 2 months 12 days | 6 years 3 months 18 days
Outstanding, beginning balance, aggregate intrinsic value | $ 4,806 | $ 21,965 | $ 21,965 |
Shares converted upon acquisition (in shares) |  | 42 |  |
Shares converted upon acquisition, weighted average exercise price (in dollars per share) |  | $ 51.86 |  |
Shares converted upon acquisition, weighted average grant date fair value |  | $ 14.86 |  |
Granted (in shares) |  | 101 |  |
Granted, weighted average exercise price (in dollars per share) |  | $ 69.30 |  |
Granted, weighted average grant date fair value |  | $ 24.83 |  |
Exercised (in shares) | (59) | (87) |  |
Exercised, weighted average exercise price (in dollars per share) | $ 40.57 | $ 40.08 |  |
Exercised, aggregate intrinsic value | $ 1,057 | $ 2,779 |  |
Forfeited (in share) | (8) | (3) |  |
Forfeited, weighted average grant date fair value (in dollars per share) | $ 67.38 | $ 68.43 |  |
Expired (in shares) | (9) | (66) |  |
Expired, weighted average exercise price (in dollars per share) | $ 66.36 | $ 95.33 |  |
Outstanding, ending balance (in shares) | 819 | 943 | 895 | 956
Outstanding, ending balance, weighted average exercise price per share (in dollars per share) | $ 48.06 | $ 46.92 | $ 47.93 | $ 47.10
Outstanding, weighted average remaining contractual life | 5 years 9 months 18 days | 6 years 8 months 12 days | 6 years 2 months 12 days | 6 years 3 months 18 days
Outstanding, ending balance, aggregate intrinsic value | $ 12,958 | $ 14,066 | $ 4,806 | $ 21,965
Exercisable (in shares) | 691 |  |  |
Exercisable, weighted average exercise price (in dollars per share) | $ 44.67 |  |  |
Exercisable, weighted average remaining contractual term | 5 years 3 months 18 days |  |  |
Exercisable, aggregate intrinsic value | $ 12,841 |  |  |
Expected to Vest [Member] |  |  |  |
[Line Items] |  |  |  |
Outstanding, weighted average remaining contractual life | 8 years 4 months 24 days |  |  |
Outstanding, ending balance (in shares) | 128 |  |  |
Outstanding, ending balance, weighted average exercise price per share (in dollars per share) | $ 66.35 |  |  |
Outstanding, weighted average remaining contractual life | 8 years 4 months 24 days |  |  |
Outstanding, ending balance, aggregate intrinsic value | $ 117 |  |  |

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