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Note 3 - Stock-based Compensation - RSU Summary (Details)
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Beginning balance (in shares) | shares 4,144
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares $ 39.91
Granted (in shares) | shares 710
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares $ 85.66
Vested (in shares) | shares (649)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares $ 42.94
Forfeited (in shares) | shares (14)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares $ 71.41
Ending balance (in shares) | shares 4,191
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares $ 47.09
Time-Based RSUs [Member]  
Beginning balance (in shares) | shares 258
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares $ 66.30
Granted (in shares) | shares 84
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares $ 113.36
Vested (in shares) | shares (92)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares $ 58.40
Forfeited (in shares) | shares (9)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares $ 77.47
Ending balance (in shares) | shares 241
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares $ 85.38
PSUs and MPSUs [Member]  
Beginning balance (in shares) | shares 2,266
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares $ 48.59
Granted (in shares) | shares 626 [1]
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares $ 81.93
Vested (in shares) | shares (557)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares $ 40.38
Forfeited (in shares) | shares (5)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares $ 60.20
Ending balance (in shares) | shares 2,330
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares $ 59.49
MSUs [Member]  
Beginning balance (in shares) | shares 1,620
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares $ 23.57
Granted (in shares) | shares [1]
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares
Vested (in shares) | shares
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares
Forfeited (in shares) | shares
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares
Ending balance (in shares) | shares 1,620
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares $ 23.57
[1] Amount reflects the number of PSUs and MPSUs that may ultimately be earned based on management's probability assessment of the achievement of performance conditions at each reporting period. In addition, MPSUs are subject to the achievement of market conditions.