CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND REDEEMABLE NONCONTROLLING INTEREST - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests
Redeemable Noncontrolling Interest - beginning balance at Mar. 31, 2017	$ 6,886
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable Noncontrolling Interest - currency translation adjustments	258
Redeemable Noncontrolling Interest, net income (loss)	(795)
Redeemable Noncontrolling Interest - ending balance at Jun. 30, 2017	6,349
Total stockholders’ investment at Mar. 31, 2017	1,289,283	$ 379	$ 809,995	$ 986,957	$ (328,277)	$ (184,796)	$ 5,025
Common stock, shares beginning balance at Mar. 31, 2017		35,213,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	3,863	$ 1	3,862
Issuance of common stock, shares		89,849
Distributions paid to noncontrolling interests	(12)						(12)
Common stock dividends	(2,465)			(2,465)
Currency translation adjustments	52						52
Net income (loss)	(54,950)			(55,275)			325
Other comprehensive loss	10,070				10,070
Total stockholders’ investment at Jun. 30, 2017	1,245,841	$ 380	813,857	929,217	(318,207)	(184,796)	5,390
Common stock, shares ending balance at Jun. 30, 2017		35,303,840
Redeemable Noncontrolling Interest - beginning balance at Mar. 31, 2017	6,886
Redeemable Noncontrolling Interest - ending balance at Dec. 31, 2017	3,859
Total stockholders’ investment at Mar. 31, 2017	1,289,283	$ 379	809,995	986,957	(328,277)	(184,796)	5,025
Common stock, shares beginning balance at Mar. 31, 2017		35,213,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid to noncontrolling interest	0
Total stockholders’ investment at Dec. 31, 2017	1,249,016	$ 381	844,825	889,735	(307,353)	(184,796)	6,224
Common stock, shares ending balance at Dec. 31, 2017		35,375,380
Redeemable Noncontrolling Interest - beginning balance at Jun. 30, 2017	6,349
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable Noncontrolling Interest - currency translation adjustments	194
Redeemable Noncontrolling Interest, net income (loss)	(541)
Redeemable Noncontrolling Interest - ending balance at Sep. 30, 2017	6,002
Total stockholders’ investment at Jun. 30, 2017	1,245,841	$ 380	813,857	929,217	(318,207)	(184,796)	5,390
Common stock, shares beginning balance at Jun. 30, 2017		35,303,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	2,134	$ 1	2,133
Issuance of common stock, shares		57,696
Distributions paid to noncontrolling interests	(11)						(11)
Currency translation adjustments	43						43
Net income (loss)	(30,856)			(31,209)			353
Other comprehensive loss	10,928				10,928
Total stockholders’ investment at Sep. 30, 2017	1,228,079	$ 381	815,990	898,008	(307,279)	(184,796)	5,775
Common stock, shares ending balance at Sep. 30, 2017		35,361,536
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable Noncontrolling Interest - currency translation adjustments	37
Redeemable Noncontrolling Interest, net income (loss)	(2,180)
Redeemable Noncontrolling Interest - ending balance at Dec. 31, 2017	3,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	2,191	$ 0	2,191
Issuance of common stock, shares		13,844
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	36,778		36,778
Adjustments to Additional Paid in Capital, Other	(40,393)		(40,393)
Adjustments to Additional Paid in Capital, Warrant Issued	30,259		30,259
Distributions paid to noncontrolling interests	(13)						(13)
Currency translation adjustments	(54)						(54)
Net income (loss)	(7,757)			(8,273)			516
Other comprehensive loss	(74)				(74)
Total stockholders’ investment at Dec. 31, 2017	1,249,016	$ 381	844,825	889,735	(307,353)	(184,796)	6,224
Common stock, shares ending balance at Dec. 31, 2017		35,375,380
Total stockholders’ investment at Mar. 31, 2018	$ 1,178,144	$ 382	852,565	788,834	(286,094)	(184,796)	7,253
Common stock, shares beginning balance at Mar. 31, 2018	35,526,625	35,526,625
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	$ 4,264	$ 3	4,261
Issuance of common stock, shares		238,650
Distributions paid to noncontrolling interests	(14)						(14)
Currency translation adjustments	(139)						(139)
Net income (loss)	(32,041)			(32,108)			67
Other comprehensive loss	(27,824)				(27,824)
Total stockholders’ investment at Jun. 30, 2018	1,120,644	$ 385	856,826	754,980	(313,918)	(184,796)	7,167
Common stock, shares ending balance at Jun. 30, 2018		35,765,275
Total stockholders’ investment at Mar. 31, 2018	$ 1,178,144	$ 382	852,565	788,834	(286,094)	(184,796)	7,253
Common stock, shares beginning balance at Mar. 31, 2018	35,526,625	35,526,625
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid to noncontrolling interest	$ (580)
Total stockholders’ investment at Dec. 31, 2018	$ 877,473	$ 385	860,745	524,846	(330,944)	(184,796)	7,237
Common stock, shares ending balance at Dec. 31, 2018	35,798,185	35,798,185
Total stockholders’ investment at Jun. 30, 2018	$ 1,120,644	$ 385	856,826	754,980	(313,918)	(184,796)	7,167
Common stock, shares beginning balance at Jun. 30, 2018		35,765,275
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	1,983	$ 0	1,983
Issuance of common stock, shares		32,910
Distributions paid to noncontrolling interests	(13)						(13)
Dividends paid to noncontrolling interest	(580)						(580)
Currency translation adjustments	(32)						(32)
Net income (loss)	(143,673)			(144,190)			517
Other comprehensive loss	(8,097)				(8,097)
Total stockholders’ investment at Sep. 30, 2018	970,232	$ 385	858,809	610,790	(322,015)	(184,796)	7,059
Common stock, shares ending balance at Sep. 30, 2018		35,798,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	1,936	$ 0	1,936
Issuance of common stock, shares		0
Distributions paid to noncontrolling interests	(13)						(13)
Currency translation adjustments	(52)						(52)
Net income (loss)	(85,701)			(85,944)			243
Other comprehensive loss	(8,929)				(8,929)
Total stockholders’ investment at Dec. 31, 2018	$ 877,473	$ 385	$ 860,745	524,846	$ (330,944)	$ (184,796)	$ 7,237
Common stock, shares ending balance at Dec. 31, 2018	35,798,185	35,798,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting guidance	$ (1,746)			$ (1,746)