Shareholders' Equity - Narrative (Details)	Mar. 15, 2019 purchase_right $ / shares shares	Sep. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Equity [Abstract]
Common stock dividend, number of preferred share purchase rights for each share of common stock | purchase_right	1
Common stock, par value (in usd per share)		$ 0.01	$ 0.01
Preferred share purchase right, ratio of number of shares per right	0.01
Preferred stock, par value (in usd per share)		$ 0.01	$ 0.01
Preferred share purchase right, exercise price (in dollars per share)	$ 150
Preferred share purchase right, period after acquisition announcement after which rights become exercisable	10 days
Preferred share purchase right, minimum beneficial ownership percentage change for rights to become exercisable	15.00%
Preferred share purchase right, minimum beneficial ownership percentage for grandfathered treatment	15.00%
Preferred share purchase right, minimum ownership percentage at which existing rights become exercisable	0.001%
Preferred share purchase right, market value of common stock that Acquiring Person may acquire for exercise price	$ 300
Preferred share purchase right, ownership percentage threshold below which rights may be extinguished by board	50.00%
Preferred share purchase right, number of shares of common stock issued if rights extinguished by board (in shares)	1
Preferred share purchase right, purchase price of acquiring corporate shares	$ 150
Preferred share purchase right, market value of acquiring corporate shares	300
Class of Stock [Line Items]
Preferred stock, authorized (in shares) | shares		10,000,000	0
Preferred stock, par value (in usd per share)		$ 0.01	$ 0.01
Series A
Equity [Abstract]
Preferred stock, par value (in usd per share)	$ 0.01
Class of Stock [Line Items]
Preferred stock, authorized (in shares) | shares	10,000,000
Preferred stock, par value (in usd per share)	$ 0.01