Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2015	$ 242,567	$ 26	$ 124,834	$ 181,539	$ (63,832)
Beginning balance (in shares) at Dec. 31, 2015		25,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock	2,082		2,082
Stock-based compensation and vesting of restricted stock (in shares)		89
Net income	23,472			23,472
Dividends declared	(11,667)			(11,667)
Changes in Accumulated Other Comprehensive (Loss) Income	(866)				(866)
Repurchases of common stock	(4,713)		(4,713)
Repurchases of common stock (in shares)		(177)
Ending balance at Sep. 30, 2016	250,875	$ 26	122,203	193,344	(64,698)
Ending balance (in shares) at Sep. 30, 2016		25,685
Beginning balance at Dec. 31, 2016	283,348	$ 27	168,299	191,108	(76,086)
Beginning balance (in shares) at Dec. 31, 2016		27,206
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock	2,457		2,457
Stock-based compensation and vesting of restricted stock (in shares)		100
Net income	38,987			38,987
Conversion of Convertible Debt	51,851	$ 2	51,849
Conversion of Convertible Debt (in shares)		1,748
Dividends declared	(14,329)			(14,329)
Changes in Accumulated Other Comprehensive (Loss) Income	21,251				21,251
Ending balance at Sep. 30, 2017	$ 383,565	$ 29	$ 222,605	$ 215,766	$ (54,835)
Ending balance (in shares) at Sep. 30, 2017		29,054