CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock. Class B common stock	Common Stock.	Paid-In Capital Class B common stock	Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income / (Loss)	Class B common stock	Total
Balance at Dec. 31, 2013		$ 226		$ 611,231	$ (245,906)	$ 139		$ 365,690
Increase (Decrease) in Shareholders' Equity
Net income / (loss)					(47,084)		$ (29,682)	(47,084)
Foreign currency translation adjustments						190		190
Stock-based compensation				1,215				1,215
Issuance of 10,688,828 shares of Class B common stock	$ 107		$ 197,031				$ 197,138
Balance at Dec. 31, 2014		333		809,477	(292,990)	329		517,149
Increase (Decrease) in Shareholders' Equity
Net income / (loss)					129,569			129,569
Issuance of common stock		150		189,657				189,807
Foreign currency translation adjustments						338		338
Stock-based compensation				12,243				12,243
Issuance of 2015 warrants				3,381				3,381
Issuance of 31,465,989 shares of common stock to acquire 2015 Acquired VLCC Newbuildings		314		464,282				464,596
Issuance of 483,970 shares of common stock for share purchase commitment		5		6,035				6,040
Issuance of 574,546 and 278,483 shares of common stock for vested 2015 and 2016 restricted stock units		6		(6)
Issuance of 1,882,223 shares of common stock for exercise of over-allotment option		19		24,619				24,638
Balance at Dec. 31, 2015		827		1,509,688	(163,421)	667		1,347,761
Increase (Decrease) in Shareholders' Equity
Net income / (loss)					67,306			67,306
Issuance of common stock				26				26
Amount recognized in other comprehensive loss on derivative						14,642		14,642
Amount recognized in net income / (loss) on derivative						2,692		2,692
Gain on liquidation of foreign subsidiaries included in net income						(730)		(730)
Foreign currency translation adjustments						63		63
Stock-based compensation				5,651				5,651
Issuance of 574,546 and 278,483 shares of common stock for vested 2015 and 2016 restricted stock units		3		(3)
Balance at Dec. 31, 2016		$ 830		$ 1,515,362	$ (96,115)	$ 17,334		$ 1,437,411