Earnings Per Share - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified				3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2014 Stock Options [Member]	Mar. 31, 2014 Common Stock	Jun. 30, 2014 Nonvested Stock Awards [Member]	Mar. 31, 2014 TEU Senior Amortizing Notes	Jun. 30, 2014 Tangible Equity Units	Mar. 31, 2014 Tangible Equity Units	Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range One [Member] TEU Senior Amortizing Notes	Jun. 30, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range One [Member] TEU Senior Amortizing Notes	Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] TEU Senior Amortizing Notes	Jun. 30, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] TEU Senior Amortizing Notes	Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] Tangible Equity Units	Jun. 30, 2014 Senior Notes [Member] TEU Senior Amortizing Notes	Sep. 30, 2013 Senior Notes [Member] TEU Senior Amortizing Notes	Jul. 17, 2012 Senior Notes [Member] Tangible Equity Units
Earnings Per Share [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities				700,000		300,000		5,200,000
Stock Issued During Period, Shares, Conversion of Units					1,368,108
Debt Instrument, Convertible, Conversion Ratio							1.5372			1.72414	1.72414	1.40746	1.40746
Common stock, par value (in US$ per share)	$ 0.001	$ 0.001	$ 0.001
Tangible Equity Units (TEUs) Converted during period units									890,000	115,433				1,252,675
Stated interest rate on debt instrument (percent)																	7.50%
Debt Instrument, Convertible, Stock Price Trigger											$ 14.50	$ 17.75	$ 17.75
Tangible Equity Units outstanding								3,700,000
Senior notes															$ 8,317	$ 16,141
Shares of common stock issuable upon conversion								5,200,000