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Long-term debt: (Details) $ in Thousands							1 Months Ended			3 Months Ended	4 Months Ended	6 Months Ended		12 Months Ended
Long-term debt: (Details) $ in Thousands	Mar. 12, 2015 USD ($)	Jun. 20, 2014 USD ($)	Jun. 16, 2014 USD ($)	Apr. 09, 2014 USD ($)	Aug. 19, 2013 USD ($)	Jan. 26, 2011 USD ($)	Mar. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Jun. 30, 2007 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2013	Dec. 31, 2008 USD ($)	Dec. 31, 2014 USD ($)
Long-term debt
Amount of debt redeemed												$ 251,280
Loss on debt extinguishment and redemption												10,144
Net proceeds from issuance of senior secured notes												248,599
Senior secured notes, premium (in dollars)																$ 4,230
Purchase of convertible notes in cash													$ 91,978
Convertible senior notes
Long-term debt
Interest rate (as a percent)									1.00%
Aggregate principal amount notes issued									$ 200,000
Aggregate face value of debt repurchased															$ 108,000
Proceeds from issuance of long-term debt, net of issuance costs									$ 195,100
Percentage of original issuance discount									2.25%
Purchase of convertible notes in cash		$ 33,500	$ 58,500												48,600
Debt and equity components for the Convertible Notes
Net carrying amount															$ 92,000
Amount of interest expense recognized and effective interest rate
Contractual coupon interest										$ 189			419
Amortization of discount and costs on Notes										1,417			3,106
Interest expense										$ 1,606			$ 3,525
Effective interest rate (as a percent)										8.70%			8.70%
Convertible senior notes \| June 15, 2014, 2017 and 2022
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase														100.00%
Convertible senior notes \| After June 20, 2014
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase														100.00%
Senior Secured Notes 2018
Long-term debt
Amount of debt redeemed							$ 240,000
Interest rate (as a percent)					8.375%	8.375%	8.375%
Aggregate principal amount notes issued					$ 65,000	$ 175,000
Amount deposited with the trustee for the benefit of the holders								$ 251,600
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase	104.188%
Aggregate face value of debt repurchased	$ 240,000
Loss on debt extinguishment and redemption												$ 10,100
Proceeds from issuance of long-term debt, net of issuance costs					69,900	170,500
Debt issuance costs					$ 1,000	$ 4,500
Premium price of debt instrument (as a percent)					109.00%
Senior secured notes, premium (in dollars)					$ 5,900
Senior Secured Notes 2022
Long-term debt
Interest rate (as a percent)								5.375%			5.375%	5.375%
Aggregate principal amount notes issued							$ 250,000	$ 250,000
Net proceeds from issuance of senior secured notes											$ 248,600
Percentage of equity interest in foreign entities used as collateral											65.00%
Period prior to maturity date may be redeemed at specified price											3 months
Permitted investments and payments											$ 87,500
Senior Secured Notes 2022 \| Minimum
Long-term debt
Consolidated leverage ratio to restrict on incurring additional indebtedness											5.0
Senior Secured Notes 2022 \| Maximum
Long-term debt
Consolidated leverage ratio to be maintained to increase amount of permitted investments and payments by consolidated cash flow											4.25
Senior Secured Notes 2022 \| Prior to December 1, 2021
Long-term debt
Percentage of redemption price of principal amount accrued interest											100.00%
Senior Secured Notes 2022 \| On or after December 1, 2021
Long-term debt
Percentage of redemption price of principal amount accrued interest											100.00%
Senior Secured Notes 2022 \| Subsidiaries
Long-term debt
Permitted investments and payments											$ 56,700
Senior Secured Notes 2022 \| Holdings
Long-term debt
Permitted investments and payments											$ 30,800
Senior Unsecured Notes 2021
Long-term debt
Permitted investments and payments												$ 87,500
Percentage of principal amount at which notes will be required to be repurchased in the event of a change of control												101.00%
Senior Unsecured Notes 2021 \| Treasury Rate
Long-term debt
Discount rate used to compute make-whole premium, basis points added to reference rate (as a percent)												0.50%
Senior Unsecured Notes 2021 \| Minimum
Long-term debt
Consolidated leverage ratio to restrict on incurring additional indebtedness												5.0
Senior Unsecured Notes 2021 \| Maximum
Long-term debt
Consolidated leverage ratio to be maintained to increase amount of permitted investments and payments by consolidated cash flow												4.25
Senior Unsecured Notes 2021 \| Prior to April 15, 2017
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase												104.219%
Percentage of redemption price of principal amount accrued interest												100.00%
Percentage of outstanding principal amount used in calculation of make-whole premium												1.00%
Maximum percentage of principal amount of debt instrument which the entity could redeem with proceeds from certain equity offerings												35.00%
Percentage of redemption price which may redeem with net cash proceeds from certain equity offerings												105.625%
Senior Unsecured Notes 2021 \| 12-month period beginning on April 15, 2017
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase												104.219%
Senior Unsecured Notes 2021 \| 12-month period beginning on April 15, 2018
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase												102.813%
Senior Unsecured Notes 2021 \| 12-month period beginning on April 15, 2019
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase												101.406%
Senior Unsecured Notes 2021 \| 12-month period beginning on April 15, 2020 and thereafter
Long-term debt
Percentage of principal amount that the holders of the Convertible Notes may require the Company to repurchase												100.00%
Senior Unsecured Notes 2021 \| Subsidiaries
Long-term debt
Permitted investments and payments												$ 56,700
Senior Unsecured Notes 2021 \| Holdings
Long-term debt
Permitted investments and payments												$ 30,800
Senior Unsecured Notes 2021 \| Cogent Finance
Long-term debt
Interest rate (as a percent)				5.625%
Aggregate principal amount notes issued				$ 200,000
Proceeds from issuance of long-term debt, net of issuance costs				$ 195,800