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Earnings Per Share and Equity Transactions - Narrative (Details) - USD ($)			1 Months Ended	12 Months Ended
	Aug. 15, 2018	Dec. 01, 2016	Dec. 01, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 27, 2016
Tender Offer Event [Line Items]
Common stock, par value (usd per share)				$ 0.001	$ 0.001
Cost of stock repurchased	$ 97,775,000
Repurchase of common stock	98,491,000			$ 98,491,000		$ 241,016,000
Refund received of excess funds associated with 2016 tender offer				$ 0	$ 1,929,000	$ 0
Common Stock
Tender Offer Event [Line Items]
Repurchase of common stock (shares)				46,559,289		89,502,449
Repurchase of common stock				$ 45,000		$ 89,000
Tender Offer Event, Shares
Tender Offer Event [Line Items]
Common stock, par value (usd per share)							$ 0.001
Repurchase of common stock (shares)		89,502,449
Percentage of outstanding stock		10.40%
Tender offer purchase price			$ 200,000,000
Allowed percentage of additional shares accepted for repurchase without amendment of offer (percent)			2.00%
Increase tender offer (shares)			14,186,716
Refund received of excess funds associated with 2016 tender offer			$ 37,700,000
Share price (usd per share)		$ 2.66	$ 2.66
Tender offer purchase price, excluding fees and expenses		$ 238,077,000
Dutch Auction
Tender Offer Event [Line Items]
Authorized repurchase amount	$ 75,000,000
Common stock, par value (usd per share)	$ 0.001
Outstanding shares, percent	2.00%
Increase in shares authorized to be repurchased (in shares)	10,706,774
Increase in authorized amount	$ 22,500,000
Purchase price (usd per share)	$ 2.10
Dutch Auction | Common Stock
Tender Offer Event [Line Items]
Repurchase of common stock (shares)	46,559,289
Percentage of outstanding stock	6.00%

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