Stockholders' equity Accumulated other comprehensive loss (Details) (USD $) In Thousands, unless otherwise specified
|
12 Months Ended |
Dec. 31, 2014
|
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward] |
|
Balance as of December 31, 2013 |
$ (36,204)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other comprehensive income (loss) before reclassifications |
28,601us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |
Amounts reclassified from other comprehensive income |
6,305us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
Amounts attributable to noncontrolling interest |
670are_OtherComprehensiveIncomelossNetofTaxAttributableetoNoncontrollingInterests |
Total other comprehensive (loss) income |
35,576us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
Balance as of December 31, 2014 |
(628)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Unrealized Gain on Marketable Securities |
|
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward] |
|
Balance as of December 31, 2013 |
1,590us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Other comprehensive income (loss) before reclassifications |
51,135us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Amounts reclassified from other comprehensive income |
(358)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Amounts attributable to noncontrolling interest |
0are_OtherComprehensiveIncomelossNetofTaxAttributableetoNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Total other comprehensive (loss) income |
50,777us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Balance as of December 31, 2014 |
52,367us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Unrealized Loss on Interest Rate Swap Agreements |
|
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward] |
|
Balance as of December 31, 2013 |
(3,321)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Other comprehensive income (loss) before reclassifications |
(4,459)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Amounts reclassified from other comprehensive income |
6,871us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Amounts attributable to noncontrolling interest |
0are_OtherComprehensiveIncomelossNetofTaxAttributableetoNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Total other comprehensive (loss) income |
2,412us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Balance as of December 31, 2014 |
(909)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Unrealized Loss on Foreign Currency Translation |
|
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward] |
|
Balance as of December 31, 2013 |
(34,473)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Other comprehensive income (loss) before reclassifications |
(18,075)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Amounts reclassified from other comprehensive income |
(208)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Amounts attributable to noncontrolling interest |
670are_OtherComprehensiveIncomelossNetofTaxAttributableetoNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Total other comprehensive (loss) income |
(17,613)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Balance as of December 31, 2014 |
$ (52,086)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |