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	2,208		2,208
Stock-based compensation and vesting of restricted stock (in shares)		19
Net income	18,159			18,159
Dividends declared	(7,791)			(7,791)
Changes in Accumulated Other Comprehensive (Income) Loss	(762)				(762)
Repurchases of common stock	(4,391)		(4,391)
Repurchases of common stock (in shares)		(172)
Ending balance at Jun. 30, 2016	249,990	$ 26	122,651	191,907	(64,594)
Ending balance (in shares) at Jun. 30, 2016		25,620
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	2,765		2,765
Stock-based compensation and vesting of restricted stock (in shares)		42
Net income	25,710			25,710
Conversion of Convertible Debt	51,851	$ 2	51,849
Conversion of Convertible Debt (in shares)		1,748
Dividends declared	(9,379)			(9,379)
Changes in Accumulated Other Comprehensive (Income) Loss	14,484				14,484
Ending balance at Jun. 30, 2017	$ 368,779	$ 29	$ 222,913	$ 207,439	$ (61,602)
Ending balance (in shares) at Jun. 30, 2017		28,996