Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Stock-Based Compensation [Abstract]

Disclosure of restricted stock award activity

The following tables summarize our restricted stock award activity for the three and six months ended June 30, 2018 and 2017.

	Three Months Ended June 30, 2018
	Number of Shares of Restricted Stock Awards (in thousands)		Weighted Average Grant Date Fair Value
Unvested at beginning of period	40.2		$	20.79
Granted	5.0		19.03
Vested	(8.7	)	22.44
Forfeited	(1.5	)	17.11
Outstanding (unvested) at end of period	35.0		$	20.29

	Six Months Ended June 30, 2018
	Number of Shares of Restricted Stock Awards (in thousands)		Weighted Average Grant Date Fair Value
Unvested at beginning of period	53.7		$	21.82
Granted	5.0		19.03
Vested	(22.2	)	23.91
Forfeited	(1.5	)	17.11
Outstanding (unvested) at end of period	35.0		$	20.29

	Three Months Ended June 30, 2017
	Number of Shares of Restricted Stock Awards (in thousands)		Weighted Average Grant Date Fair Value
Unvested at beginning of period	44.5		$	20.33
Granted	3.0		20.53
Vested	(7.0	)	24.03
Forfeited	—		—
Outstanding (unvested) at end of period	40.5		$	19.69

	Six Months Ended June 30, 2017
	Number of Shares of Restricted Stock Awards (in thousands)		Weighted Average Grant Date Fair Value
Unvested at beginning of period	53.0		$	21.53
Granted	3.0		20.53
Vested	(15.5	)	25.17
Forfeited	—		—
Outstanding (unvested) at end of period	40.5		$	19.69