Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

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, 2018	1,516		$	42.97
Granted	930		$	41.92
Vested	(665	)	$	35.94
Forfeited	(6	)	$	45.41
Nonvested at March 31, 2019	1,775		$	44.77
Granted	125		$	40.78
Vested	(28	)	$	50.43
Forfeited	(37	)	$	45.13
Nonvested at June 30, 2019	1,835		$	44.40

Schedule of Share-based Compensation, Performance Shares Award Unvested Activity

	Number of shares (thousands)		Weighted average grant date fair value
Nonvested at December 31, 2018	297		$	60.35
Granted	190		$	51.52
Forfeited	(9	)	$	55.30
Nonvested at March 31, 2019	478		$	56.93
Granted	5		$	51.59
Forfeited	(56	)	$	55.67
Nonvested at June 30, 2019	427		$	57.03

	Number of shares (thousands)		Weighted average grant date fair value
Nonvested at December 31, 2018	297		$	47.03
Granted	190		$	41.90
Forfeited	(9	)	$	44.12
Nonvested at March 31, 2019	478		$	45.04
Granted	5		$	41.92
Forfeited	(56	)	$	44.24
Nonvested at June 30, 2019	427		$	45.11