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Comprehensive Income and Capital Structure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Stockholders Equity, Opening Balance			$ 817,101us-gaap_StockholdersEquity
Issuance of common stock			3,171
Stock-based compensation			4,744us-gaap_ShareBasedCompensation	5,489us-gaap_ShareBasedCompensation
Net income	(9,786)us-gaap_NetIncomeLoss	(12,117)us-gaap_NetIncomeLoss	3,121us-gaap_NetIncomeLoss	2,840us-gaap_NetIncomeLoss
Other comprehensive loss			(9,656)
Stockholders Equity, Ending Balance	818,481us-gaap_StockholdersEquity	763,356us-gaap_StockholdersEquity	818,481us-gaap_StockholdersEquity	763,356us-gaap_StockholdersEquity
Common Stock
Stockholders Equity, Opening Balance			493
Issuance of common stock			2
Stock-based compensation			0
Net income			0
Other comprehensive loss			0
Stockholders Equity, Ending Balance	495		495
Additional Paid-in Capital
Stockholders Equity, Opening Balance			328,059
Issuance of common stock			3,169
Stock-based compensation			4,744
Net income			0
Other comprehensive loss			0
Stockholders Equity, Ending Balance	335,972		335,972
Retained Earnings
Stockholders Equity, Opening Balance			495,128
Issuance of common stock			0
Stock-based compensation			0
Net income			3,121
Other comprehensive loss			0
Stockholders Equity, Ending Balance	498,249		498,249
Accumulated Other Comprehensive Income (Loss)
Stockholders Equity, Opening Balance			(6,579)
Issuance of common stock			0
Stock-based compensation			0
Net income			0
Other comprehensive loss			(9,656)
Stockholders Equity, Ending Balance	$ (16,235)		$ (16,235)