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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity
 
Shares subject to restriction
(thousands)
 
Weighted average grant date fair value
Nonvested at December 31, 2017
1,593

 
$
38.86

Granted
625

 
$
52.64

Vested
(486
)
 
$
41.05

Forfeited
(7
)
 
$
49.48

Nonvested at March 31, 2018
1,725

 
$
43.26
Schedule of Share-based Compensation, Performance Shares Award Unvested Activity
 
Number of shares (thousands)
 
Weighted average grant date fair value
Nonvested at December 31, 2017
355

 
$
39.42

Granted
175

 
$
52.64

Nonvested at March 31, 2018
530

 
$
43.79