Capital Stock (Details) - USD ($)		6 Months Ended	12 Months Ended
	Dec. 09, 2016	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 21, 2016	Dec. 31, 2015
Class of Warrant or Right [Line Items]
Shares Issued, Price Per Share		$ 5.50				$ 5.15	$ 11.43
Proceeds from Issuance of Common Stock	$ 109,700,000	$ 60,200,000	$ 152,657,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 5.75
Warranty Liability						$ 18,503,000			$ 0
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right						11,200,000
Fair Value Adjustment of Warrants			$ 2,106,000	$ 0	$ 0
per share net of underwrtiter discount		$ 5.2525	$ 4.9183
Common Stock, Shares, Issued	22,300,000	11,500,000				117,851,063		11,500,000	83,013,971
Unitssubjecttounderwritersoption		1,500,000
Common stock, shares authorized						150,000,000			100,000,000
Common stock, par value (in dollars per share)						$ 0.01			$ 0.01
Preferred stock, shares authorized						5,000,000
Preferred stock, par value						$ 0.01
Common Stock, Shares, Outstanding		80,256,544	80,256,544	79,649,946	78,855,547	114,985,072			80,256,544
Treasury stock, shares held		2,767,084	2,767,084	2,672,930	2,478,084	2,865,991			2,767,084
Preferred stock, shares issued						0
Common Shares Outstanding and Treasury Shares Held Rollforward [Table]
Common shares outstanding, beginning balance		80,256,544	80,256,544	79,649,946	78,855,547
Exercise of common stock options, net			636,937	67,808	290,369
Grants of restricted stock, net			281,591	538,790	504,030
Common shares outstanding, ending balance			114,985,072	80,256,544	79,649,946
Treasury stock, beginning balance		2,767,084	2,767,084	2,672,930	2,478,084
Shares received upon exercise of common stock options			13,854	36,818	189,469
Shares received upon vesting of restricted stock, net			85,053	57,336	5,377
Treasury stock, ending balance			2,865,991	2,767,084	2,672,930
Amount authorized under stock repurchase program						$ 20,000,000
Amount repurchased under the stock repurchase program in the period			$ 0